| Music: "Come Josephine, In My Flying Machine," 1910, performed by Ada Jones & Billy Murray from Internet Archive. |
 Hemp Brake
by John T. Gilman
1864
 Sugar Evaporator
by James High
1863
 Tire Bender
by Joseph Tomlinson
1873
 Design for a Pin
by Roy Kleineck
1943
 Denture Cleaner
by Brian James
1993
|
|
PAT. #
|
NAME
|
TOWN
|
TITLE
|
DATE
|
| 3693593 | Ackermann, Harry John | Monticello | automatic poultry feeding device | 26 Sep 1972 |
| 209639 | Ainsworth, Clark | Monticello | harvester | 5 Nov 1878 |
| 212879 | Ainsworth, Clark | Monticello | elevator for harvesters | 4 Mar 1879 |
| 3931877 | Albaugh, LeMar L. | Anamosa | material diverter structure | 13 Jan 1976 |
| 46202 | Aldrich, David C. | Anamosa | churn | 7 Feb 1865 |
| 1018227 | Althen, Frederick C. | Anamosa | bias band maker | 20 Feb 1912 |
| 1561453 | Althen, Frederick C. | Anamosa | milk bottle carrier | 17 Nov 1925 |
| 656495 | Anderson, James P. | Anamosa | carburetor | 21 Aug 1900 |
| 2516744 | Arends, Arnold J. | Monticello | cow tail holder | 25 Jul 1950 |
| 30390 | Baldwin, William | Anamosa | tanning | 16 Oct 1860 |
| 4883022 | Barker, B. A, | Monticello | animal waterer | 28 Nov 1989 |
| 3835882 | Barker, Bernard A. | Monticello | float valve assembly | 17 Sep 1974 |
| 4901753 | Barker, Bernard A. | Monticello | float assembly valve | 20 Feb 1990 |
| 183107 | Beam, Charles | Jackson Twp | milk safe | 10 Oct 1876 |
| 1103169 | Beam, Frank B. | Anamosa | combined dish drainer, steamer, roaster, or baking pan | 14 Jul 1914 |
| 1510972 | Beam, Stephen E. | Anamosa | casket stand | 7 Oct 1924 |
| 25671 | Beardsley, Frederick F. | Castle Grove | tanning composition | 4 Oct 1859 |
| 348715 | Bedford, George J. | Anamosa | freight car lock | 7 Sep 1886 |
| 384736 | Bedford, George J. | Anamosa | mail pouch | 19 Jun 1888 |
| 459484 | Bedford, George J. | Anamosa | lock | 15 Sep 1891 |
| 759961 | Beems, Clark A. | Anamosa | knockdown box | 17 May 1904 |
| 1033980 | Belknap, John A. | Anamosa | spade step | 30 Jul 1912 |
| 751451 | Belknap, Thomas M. | Anamosa | rail joint | 9 Feb 1904 |
| 934132 | Benedict, James Z. | Monticello | push cart | 14 Sep 1909 |
| 3059444 | Bickel, Fay D. | Anamosa | freezing apparatus | 16 Oct 1962 |
| 493814 | Bingham, William F. | Monticello | watch bow fastener | 21 Mar 1893 |
| 493815 | Bingham, William F. | Monticello | watch key | 21 Mar 1893 |
| 363981 | Bissell, Daniel J. | Anamosa | cultivator attachment | 31 May 1887 |
| 508401 | Blood, Charles N. | Anamosa | stump extractor | 14 Nov 1893 |
| 523100 | Blood, Charles N. | Anamosa | stump extractor | 17 Jul 1894 |
| 525481 | Blood, Charles N. | Anamosa | rope grip | 4 Sep 1894 |
| 533431 | Blood, Charles N. | Anamosa | stump extractor | 5 Feb 1895 |
| 2261048 | Bobst, Charles P. | Anamosa | cover or lid fastener | 28 Oct 1941 |
| 4175418 | Bollwitt, Duaine L. | Monticello | temperature monitoring and temperature differential control device | 27 Nov 1979 |
| 51947 | Bowen, Asa C. | Bowen’s Prairie | hay loader | 9 Jan 1866 |
| 77248 | Bradstreet, S. Y. | Monticello | safety truck | 28 Apr 1868 |
| RE3024 | Bradstreet, S. Y. | Monticello | improved safety truck | 7 Jul 1868 |
| 5521608 | Brandt, Robert L. | Anamosa | multibay coplanar direction finding antenna | 28 May 1996 |
| 810708 | Brister, Samuel H. | Monticello | brush | 23 Jan 1906 |
| 4441824 | Brokaw, Kim C. | Monticello | portable waste agitator | 10 Apr 1984 |
| 164554 | Bronson, James W. | Wyoming | bridle bit | 15 Jun 1875 |
| 703232 | Brown, Frank E. | Anamosa | ice skate | 24 Jun 1902 |
| 340281 | Brownell, Benjamin C. | Center Junction | self clearing breaking plow colter | 20 Apr 1886 |
| 1370781 | Burns, James L. | Anamosa | toilet tank and valve | 8 Mar 1921 |
| 141916 | Burns, Joseph | Anamosa | earth boring machine | 19 Aug 1873 |
| 732274 | Byrne, Michael F. | Monticello | screen and storm door | 30 Jun 1903 |
| 5886665 | Carlson, Stephen G. | Anamosa | gnss local constellation/ acquisition aiding system | 23 Mar 1999 |
| 5309598 | Carpenter, Joyce A. | Oxford Junction | paint scraper kit | 10 May 1994 |
| 5461736 | Carpenter, Joyce A. | Oxford Junction | portable hydraulic lift step stool for raising handicapped patients to an elevated location | 31 Oct 1995 |
| 814830 | Carroll, Louis W. | Anamosa | telephone system | 13 Mar 1906 |
| 958224 | Carroll, Louis W. | Anamosa | electric signaling apparatus | 17 May 1910 |
| 996701 | Carroll, Louis W. | Anamosa | automatic cut out for aerial telephone lines and the like | 4 Jul 1911 |
| 1036796 | Carroll, Louis W. | Anamosa | selective signal | 27 Aug 1912 |
| 651297 | Cashen, John | Monticello | vehicle brake | 5 Jun 1900 |
| 149639 | Chandler, John A. | Monticello | reamer for earth borers | 14 Apr 1874 |
| 193395 | Chandler, John A. | Monticello | wood sawing machine | 24 Jul 1877 |
| 191001 | Chase, Job | Langworthy | hay stacker | 22 May 1877 |
| 171549 | Chatfield, Alonzo B. | Anamosa | door spring | 28 Dec 1875 |
| 574136 | Clark, Leroy | Monticello | corn husker | 29 Dec 1896 |
| 550946 | Clymer, Albert | Olin | sawbuck | 10 Dec 1895 |
| 674758 | Cole, Rebecca J. | Olin | kitchen cabinet | 21 May 1901 |
| 203421 | Cole, Sherman M. | Anamosa | pump | 17 May 1878 |
| 296531 | Cole, Sherman M. | Anamosa | measuring pump | 8 Apr 1884 |
| 324301 | Cole, Sherman M. | Anamosa | measuring pump | 11 Aug 1885 |
| 400637 | Cole, Sherman M. | Anamosa | washing machine | 2 Apr 1889 |
| 771715 | Cole, Sherman M. | Anamosa | fire escape | 4 Oct 1904 |
| 777003 | Cole, Sherman M. | Anamosa | rotating door | 6 Dec 1904 |
| 936761 | Cole, Sherman M. | Anamosa | cuff shaper | 12 Oct 1909 |
| 6125685 | Collier, Rebecca E. | Madison | apparatus and method for the evaluation of asphalt mixes | 3 Oct 2000 |
| 918970 | Conmey, Fred W. | Wyoming | fuel economizer | 20 Apr 1909 |
| 574136 | Conner, Patrick H. | Monticello | corn husker | 29 Dec 1896 |
| 581065 | Conner, Patrick H. | Monticello | hitching post | 20 Apr 1897 |
| 590610 | Conner, Patrick H. | Monticello | hay loader coupling | 28 Sep 1897 |
| 611354 | Conner, Patrick H. | Monticello | vending machine | 27 Sep 1898 |
| 200897 | Conser, Eli P. | Monticello | revolving box churn and device for operating the same | 5 Mar 1878 |
| 30390 | Crane, Boswell | Anamosa | tanning | 16 Oct 1860 |
| 471233 | Crane, Sylvannus B. | Oxford Junction | automatic car indicator operating device | 22 Mar 1892 |
| 430117 | Crane, Sylvanus B. | Oxford Junction | station indicator | 17 Jun 1890 |
| 1523176 | Cubbage, Dacil | Oxford Junction | foot accelerator for motor vehicles | 13 Jan 1925 |
| 2614433 | Cuckler, David E. | Monticello | portable power unit | 21 Oct 1952 |
| 232388 | Cudworth, John G. | Anamosa | milk cooler | 21 Sep 1880 |
| 304522 | Cummings, Charles A. | Monticello | trace-carrier | 2 Sep 1884 |
| 317443 | Cunningham, Phebe J. | Amber | flower stand | 5 May 1885 |
| 241939 | Curtis, Nimrod J. | Martelle | check rower for corn planters | 24 May 1881 |
| 241939 | Curtis, William J.T. | Martelle | check rower for corn planters | 24 May 1881 |
| 1327088 | Curttright, George L. | Olin | hog oiler | 6 Jan 1920 |
| 440421 | Curttwright, John E. | Onslow | combine rack and dish warmer | 11 Nov 1890 |
| 3465832 | De Larm, Gerald L. | Wyoming | farm implement lift assembly and drawbar combination | 9 Sep 1969 |
| 6325399 | DeMoss, David | Anamosa | side lift wheel chairs | 4 Dec 2001 |
| 6412424 | Dirks, Dave | Monticello | tailgate display table | 2 Jul 2002 |
| 3028905 | Dirks, Henry D. | Anamosa | shaft straightening machine | 10 Apr 1962 |
| 1228540 | Druecker, Joseph M. | Stone City | automatic dumping and righting mechanism for tiltable dump cars | 5 Jun 1917 |
| 1575554 | Dufloth, Philip L. | Anamosa | knife sharpener | 2 Mar 1926 |
| 720120 | Elges, Gottlieb D. | Monticello | window screen | 10 Feb 1903 |
| 401259 | Ellis, Lucien W. | Anamosa | sheaf carrier for harvesters | 9 Apr 1889 |
| 401259 | Ellis, Lucien W. | Anamosa | sheaf carrier for harvesters | 9 Apr 1889 |
| 480944 | Ellis, Lucien W. | Anamosa | bundle carrier for harvesters | 16 Aug 1892 |
| 549114 | Ellis, Lucien W. | Anamosa | sheaf carrier | 5 Nov 1895 |
| 4910443 | Etscheidt, Ronald J. | Anamosa | electronic control circuit for a bidirectional motor | 20 Mar 1990 |
| 4912380 | Etscheidt, Ronald J. | Anamosa | field installable electrical operator for a circuit breaker | 27 Mar 1990 |
| 4921083 | Etscheidt, Ronald J. | Anamosa | clutch module with predetermined torque | 1 May 1990 |
| 5166862 | Etscheidt, Ronald J. | Anamosa | panel for mounting electronics | 24 Nov 1992 |
| 5486666 | Etsheidt, Ronald J. | Anamosa | protective cover for electrical terminals and method of using same | 23 Jan 1996 |
| 581882 | Fagan, Lewis E. | Onslow | equalizing device for windmills | 4 May 1897 |
| 648102 | Fagan, Lewis E. | Onslow | draft equalizer | 24 Apr 1900 |
| 1653353 | Farmer, Guy E. | Anamosa | ice cream gun | 20 Dec 1927 |
| 818946 | Flowers, Isaac | Martelle | time controlling mechanism for pumps | 24 Apr 1906 |
| 680376 | Forsythe, James | Onslow | expansion drill | 13 Aug 1901 |
| 1285666 | Franklin, Ray W. | Monticello | switch for elevated carriers | 26 Nov 1918 |
| 1301417 | Franklin, Ray W. | Monticello | connecting device | 22 Apr 1919 |
| 1317695 | Franklin, Ray W. | Monticello | rail and cable connection | 7 Oct 1919 |
| 1322686 | Franklin, Ray W. | Monticello | stanchion | 25 Nov 1919 |
| 641586 | French, Carl E. | Monticello | combined clothes reel and tent | 16 Jan 1900 |
| 641586 | French, Oscar D. | Monticello | combined clothes reel and tent | 16 Jan 1900 |
| 800368 | Frutchey, Lydia | Martelle | mitten | 26 Sep 1905 |
| 2234524 | Fulwider, Forest L. | Anamosa | churn support | 11 Mar 1941 |
| 5788307 | Gilbert, Louis A. | Anamosa | pickup body protection apparatus | 4 Aug 1998 |
| 5944372 | Gilbert, Louis A. | Anamosa | pickup body protection apparatus | 31 Aug 1999 |
| 42847 | Gillman, John T. | Walnut Fork | hemp brake | 24 May 1864 |
| 304522 | Glaser, John C. | Monticello | trace-carrier | 2 Sep 1884 |
| 4888937 | Glenn, Willis H. | Olin | apparatus for bagging hay bales | 26 Dec 1989 |
| 941874 | Gorman, Grover M. | Anamosa | corn planter | 30 Nov 1909 |
| 147632 | Graham, David | Anamosa | washing machine | 17 Feb 1874 |
| 1096905 | Griffith, John C. | Anamosa | cement block molding machine | 19 May 1914 |
| 44088 | Hadley, R. S. | Anamosa | water wheel | 6 Sep 1864 |
| 317768 | Hakes, Frank M. | Martelle | harrow | 12 May 1885 |
| 1167295 | Hall, John S. | Monticello | pulley block | 4 Jan 1916 |
| 1500315 | Hall, Nelson C. | Olin | tool | 8 Jul 1924 |
| 1558981 | Hall, Thomas C. | Anamosa | cuspidor | 27 Oct 1925 |
| 178435 | Hannan, Joseph | Jones Co | hog trough | 6 Jun 1876 |
| 178435 | Hannan, Joseph | Jones Co | hog trough | 6 Jun 1876 |
| 1045704 | Hansell, Marcus E. | Anamosa | furnace grate | 26 Nov 1912 |
| 1207751 | Hansell, Marcus E. | Anamosa | grate bar | 12 Dec 1916 |
| 1134968 | Hanson, Bennie P. | Monticello | neck yoke | 6 Apr 1915 |
| 1134969 | Hanson, Bennie P. | Monticello | tongue construction | 6 Apr 1915 |
| 1137712 | Hanson, Bennie P. | Monticello | whiffletree | 27 Apr 1915 |
| 6351464 | Hanson, Joel K. | Anamosa | virtual second line hybrid network communication system | 26 Feb 2002 |
| 6393017 | Hanson, Joel K. | Anamosa | virtual pbx system | 21 May 2002 |
| 6535585 | Hanson, Joel | Anamosa | system and method for notification upon successful message delivery | 18 Mar 2003 |
| 6697474 | Hanson, Joel | Anamosa | systems and methods for receiving telephone calls via instant messaging | 24 Feb 2004 |
| 6766001 | Hanson, Joel | Anamosa | process and apparatus for messaging upon incomplete call | 20 Jul 2004 |
| 6775272 | Hanson, Joel K. | Anamosa | virtual pbx system | 10 Aug 2004 |
| 6868074 | Hanson, Joel | Anamosa | mobile data device and method of locating mobile data device | 15 Mar 2005 |
| 247053 | Harris, Nathaniel F. | Monticello | can | 13 Sep 1881 |
| 164554 | Hartson, LaFayette | Wyoming | bridle bit | 15 Jun 1875 |
| 180762 | Hartson, LaFayette | Wyoming | trace fastening | 8 Aug 1876 |
| 215919 | Hartson, LaFayette | Wyoming | grain steamer and drier | 27 May 1879 |
| 254311 | Hartson, LaFayette | Wyoming | buckle attachment for straps | 28 Feb 1882 |
| 281870 | Hartson, LaFayette | Wyoming | harness buckle and loop | 24 Jul 1883 |
| 303372 | Hartson, LaFayette | Wyoming | crupper former and stretcher | 12 Aug 1884 |
| 336313 | Hartson, LaFayette | Wyoming | wear plate for harness | 16 Feb 1886 |
| 2023835 | Heiken, Carl G. | Anamosa | electrified stock hurdle | 10 Dec 1935 |
| 437199 | Heisey, John H. | Monticello | can handle | 30 Sep 1890 |
| 606760 | Heisey, John H. | Monticello | wire stretcher | 5 Jul 1898 |
| 745013 | Heisey, John H. | Monticello | wire stretcher | 24 Nov 1903 |
| 836379 | Helsey, John H. | Monticello | wire stretcher | 20 Nov 1906 |
| 384205 | Henry, Charles A. | Monticello | hay loader | 5 Jun 1888 |
| 488561 | Henry, Charles A. | Monticello | hay loader | 27 Dec 1892 |
| 40934 | High, James | Walnut Fork | sugar evaporator | 15 Dec 1863 |
| 672768 | Hine, Thomas W. | Scotch Grove | nut lock | 23 Apr 1901 |
| 507070 | Hines, Thomas O. | Jackson Township, Jones Co | beehive | 17 Oct 1893 |
| 1047222 | Hoag, Ray C. | Monticello | duster | 17 Dec 1912 |
| 2416585 | Holub, Arthur E. | Wyoming | reel for barbed wire | 25 Feb 1947 |
| 514369 | Husmann, John | Scotch Grove | device for attaching hay loaders to wagons | 6 Feb 1894 |
| 514369 | Husmann, Tobe | Scotch Grove | device for attaching hay loaders to wagaons | 6 Feb 1894 |
| D337163 | James, Brian | Monticello | ultrasonic denture cleaner for household use | 6 Jul 1993 |
| 6243277 | Jenkins, Daniel E. | Anamosa | bi-directional dc to dc converter for energy storage applications | 5 Jun 2001 |
| 1137977 | Jenney, Robert T. | Monticello | vehicle tongue draft appliance | 4 May 1915 |
| 1184960 | Jenney, Robert T. | Monticello | wagon end gate | 30 May 1916 |
| 1214039 | Jenney, Robert T. | Monticello | means for operating driven mechanisms | 30 Jan 1917 |
| 1251040 | Jenney, Robert T. | Monticello | knee protector | 25 Dec 1917 |
| 2472080 | Jordan, William D. | Anamosa | barrel contracting tool | 7 Jun 1949 |
| 3481061 | Julin, William N. | Monticello | self opening greeting cards | 2 Dec 1969 |
| 3688228 | Karge, Joseph R. | Anamosa | actuating mechanism for operating handle of electrical switching device | 29 Aug 1972 |
| 3794943 | Karge, Joseph R. | Anamosa | motor driven actuating mechanism for a pivotable operating handle of an electrical control device | 26 Feb 1974 |
| 296180 | Kersten, Marzell | Garfield | metallic tag | 1 Apr 1884 |
| 347180 | Kersten, Marzell | Oxford Junction | seal lock | 10 Aug 1886 |
| 992778 | Ketcham, George G. | Anamosa | wagon hay rack | 23 May 1911 |
| 396659 | Ketcham, James H. | Anamosa | ditching spade | 22 Jan 1889 |
| 396659 | Ketcham, John E. | Anamosa | ditching spade | 22 Jan 1889 |
| 396659 | Ketcham, Squire E. | Anamosa | ditching spade | 22 Jan 1889 |
| 353032 | Kimball, Charles E. | Anamosa | valve gear | 23 Nov 1886 |
| 164743 | Kimball, John M. | Wyoming | hog trap | 22 Jun 1875 |
| 1118021 | Klein, Hans | Olin | brake | 24 Nov 1914 |
| 1380215 | Kleineck, Roy J. | Oxford Junction | tire chain | 31 May 1921 |
| 1445598 | Kleineck, Roy J. | Oxford Junction | tire chain, hook, and tightener | 13 Feb 1923 |
| D136020 | Kleineck, Roy J. | Onslow | design for a pin or similar article | 30 Jul 1943 |
| 4591109 | Kremer, Stephen H. | Monticello | wire dispensing multi-spool protective holder | 27 May 1986 |
| 3849012 | Krous, Theodore | Monticello | building structure fastener | 19 Nov 1974 |
| 169009 | Krouse, John G. | Onslow | hay raker and loader | 19 Oct 1875 |
| 1225651 | Krouse, William G. | Wyoming | engine supporting device | 8 May 1917 |
| 1230174 | Krouse, William G. | Wyoming | spark retarder for Ford engines | 19 Jun 1917 |
| 358400 | Kuhlman, Joseph F. | Anamosa | washing machine | 22 Feb 1887 |
| 378138 | Kuhlman, Joseph F. | Anamosa | washing machine | 21 Feb 1888 |
| 3116618 | Lacey, Floyd S. | Onslow | slip clutch | 7 Jan 1964 |
| 537834 | Lake, George W. | Monticello | weather strip | 23 Apr 1895 |
| 1251040 | Langer, Rudolph J. | Monticello | knee protector | 25 Dec 1917 |
| 1371175 | Langer, Rudolph J. | Monticello | basket handle | 8 Mar 1921 |
| 1371175 | Langer, Rudolph J. | Monticello | basket handle | 8 Mar 1921 |
| 1413410 | Langer, Rudolph J. | Monticello | feed trough for animal pens | 18 Apr 1922 |
| 1621209 | Langer, Rudolph J. | Monticello | stanchion | 15 Mar 1927 |
| 1621210 | Langer, Rudolph J. | Monticello | stop bar | 15 Mar 1927 |
| 1698759 | Langer, Rudolph J. | Monticello | handle bar for implements | 15 Jan 1929 |
| 1752095 | Langer, Rudolph J. | Monticello | stanchion | 25 Mar 1930 |
| 1806473 | Langer, Rudolph J. | Monticello | watering bowl | 19 May 1931 |
| 1889204 | Langer, Rudolph J. | Monticello | clevis | 29 Nov 1932 |
| 1895165 | Langer, Rudolph J. | Monticello | fence post brace | 24 Jan 1933 |
| 5986559 | Larson, Tad D. | Anamosa | infinitely adjustable position sensor with visual confirmation | 16 Nov 1999 |
| 6003387 | Larson, Tad D. | Anamosa | flow sensor for use on crop harvesting having two arms and a middle integrated portion extending in the flow path | 21 Dec 1999 |
| 356541 | Lasack, Adolf | Oxford Junction | hay loader | 25 Jan 1887 |
| 404096 | Lasack, Adolph | Oxford Junction | hay loader | 28 May 1889 |
| 428844 | Lasack, Adolph | Oxford Junction | hay loader | 27 May 1890 |
| 453492 | Lasack, Adolph | Oxford Junction | hay loader | 2 Jun 1891 |
| 453492 | Lasack, Albert | Oxford Junction | hay loader | 2 Jun 1891 |
| 1209309 | Lathrop, James H. | Oxford Junction | stock waterer | 19 Dec 1916 |
| 802868 | Laude, William H. | Monticello | rivet cutter | 24 Oct 1905 |
| 1018064 | Laude, William H. | Monticello | sod cutter | 20 Feb 1912 |
| 714493 | Lawrence, Joseph O. | Monticello | cultivator | 25 Nov 1902 |
| 4342406 | Lee, Gerry A. | Olin | dispenser flow proportioning device | 3 Aug 1982 |
| 1417845 | Leesekamp, Andrew | Anamosa | cask cover | 30 May 1922 |
| 1113451 | Levasseur, Clement C. | Martelle | rural mail delivery apparatus | 13 Oct 1914 |
| 380211 | Levasseur, John E. | Monticello | butter can | 27 Mar 1888 |
| 403054 | Levasseur, John E. | Monticello | butter can | 7 May 1889 |
| 241033 | Lewis, Alexander | Monticello | device for skimming milk | 3 May 1881 |
| 294644 | Liddy, Dennis H. | Monticello | coupling plate for whiffletrees | 4 Mar 1884 |
| 153580 | Linnell, J. M. | Monticello | sawing machines | 28 Jul 1874 |
| 203169 | Lunger, William W. | Anamosa | nut lock | 30 Apr 1878 |
| 205110 | Lunger, William W. | Anamosa | clip for neck yokes | 18 Jun 1878 |
| 37698 | Luther, Jacob | Walnut Fork | water wheel | 17 Feb 1863 |
| 2885097 | Lyon, Donald G. | Monticello | automatic pallet loader | 5 May 1959 |
| 3022905 | Lyon, Donald G. | Monticello | unloader apparatus for stacked articles or the like | 27 Feb 1962 |
| 354562 | Matthews, Cyrus | Anamosa | bread toaster | 21 Dec 1886 |
| 1012393 | Matthews, John H. | Monticello | wire stretcher | 19 Dec 1911 |
| 1095997 | Matthews, John H. | Monticello | woven wire clamp | 5 May 1914 |
| 5425305 | Mauritz, Forrest | Monticello | hydraulic cylinder piston with center flow bypass valve | 20 Jun 1995 |
| 6170383 | Mauritz, Forrest | Monticello | piston bypass valve | 9 Jan 2001 |
| 44642 | McClure, B. W. | Wyoming | horse collar block | 11 Oct 1864 |
| 88400 | McClure, B. W. | Wyoming | horse collar | 30 Mar 1869 |
| 206119 | McGinty, Edward H. | Center Junction | car coupling | 16 Jul 1878 |
| 3132833 | McLaughlin, James N. | Monticello | jack | 12 May 1964 |
| 3167055 | McLaughlin, James N. | Monticello | animal actuated insecticide applicator | 26 Jan 1965 |
| 206119 | Mead, Francis | Center Junction | car coupling | 16 Jul 1878 |
| 2942835 | Meyer, Lester E. | Olin | automatic weigher for cattle feed | 28 Jun 1960 |
| 2942836 | Meyer, Lester Ernest | Olin | automatic weigher for cattle feed and the like | 28 Jun 1960 |
| 1320887 | Michels, Charles Sr. | Anamosa | chimney cleaner and safety device | 4 Nov 1919 |
| 308783 | Milne, Hector A. | Monticello | capstan for stump extractors | 2 Dec 1884 |
| 308783 | Milne, James J.J. | Monticello | capstan for stump extractors | 2 Dec 1884 |
| 330722 | Milne, James | Scotch Grove | device for coupling rope | 17 Nov 1885 |
| 474675 | Milne, James | Scotch Grove | rope hook | 10 May 1892 |
| 475333 | Milne, James | Scotch Grove | stump puller | 24 May 1892 |
| 330722 | Milne, Joseph J. | Scotch Grove | device for coupling rope | 17 Nov 1885 |
| 1275070 | Moncrief, Sherman | Center Junction | broom holder | 6 Aug 1918 |
| 1195492 | Moore, V. Charles | Monticello | envelop | 22 Aug 1916 |
| 1113451 | Morris, Daniel M. | Martelle | rural mail delivery apparatus | 13 Oct 1914 |
| 1379712 | Munkel, Walter G. | Anamosa | flush tank and flush valve therefor | 31 May 1921 |
| 1451430 | Munkel, Walter G. | Anamosa | toilet hopper | 10 Apr 1923 |
| 946765 | Myers, Josiah | Anamosa | mop ringer | 18 Jan 1910 |
| 333363 | Nash, Amasa W. | Garfield | spring bed | 29 Dec 1885 |
| 744094 | Netcott, George A. | Monticello | fire escape | 17 Nov 1903 |
| 1173456 | Neumann, John F. | Anamosa | target | 29 Feb 1916 |
| 772251 | NIchols, John H. | Anamosa | flue stop | 11 Oct 1904 |
| 82341 | Nicholson, J. S. | Anamosa | clothes press | 22 Sep 1868 |
| 4499908 | Niehaus, Frederick D. | Martelle | combine concave structure | 19 Feb 1985 |
| 3336786 | Norlin, Carmen L. | Monticello | bicycle repair tool | 22 Aug 1967 |
| 437199 | Oliver, Thomas | Monticello | can handle | 30 Sep 1890 |
| 450107 | Oliver, Thomas | Monticello | type writing machine | 7 Apr 1891 |
| 3866756 | Oltman, Fay W. | Anamosa | pen stand | 18 Feb 1975 |
| 3856420 | Oltmann, Fay W. | Anamosa | extended life pen | 24 Dec 1974 |
| 153013 | Page, Dexter | Monticello | earth augers | 14 Jul 1874 |
| 1117081 | Parker, Frank L. | Anamosa | rerailing device | 10 Nov 1914 |
| 2599935 | Pasker, Gerald J. | Monticello | hydraulic line coupling | 10 Jun 1952 |
| 2849255 | Pasker, Gerald J. | Monticello | hoist mechanism for dump trucks | 26 Aug 1958 |
| 3236189 | Pasker, Gerald J. | Monticello | variable delivery piston pump | 22 Feb 1966 |
| 447199 | Paul, Lawrence H. | Wyoming | return pulley | 24 Feb 1891 |
| 4502414 | Paulsen, Nick E. | Center Junction | farrowing pen | 5 Mar 1985 |
| 1457265 | Peck, Leland E. | Wyoming | press | 29 May 1923 |
| 1241145 | Peet, Truman J. | Monticello | crimping machine | 25 Sep 1917 |
| 1610582 | Pegariek, George | Oxford Junction | hay wagon | 14 Dec 1926 |
| 1546507 | Pegorik, Anthony | Oxford Junction | pump attachment | 21 Jul 1925 |
| 245973 | Pelton, Phineas | Martelle | car coupling | 23 Aug 1881 |
| 382007 | Pierce, Charles | Monticello | belt tightener | 1 May 1888 |
| 25671 | Pierce, Seneca | Castle Grove | tanning composition | 4 Oct 1859 |
| 611354 | Podhaski, Frank M. | Monticello | vending machine | 27 Sep 1898 |
| 373305 | Quigley, William F. | Anamosa | felt boot | 15 Nov 1887 |
| 197663 | Quinby, Levi C. | Monticello | feather renovator | 27 Nov 1877 |
| 208635 | Quinby, Levi C. | Monticello | metallic harness loop | 1 Oct 1878 |
| 250350 | Quinby, Levi C. | Monticello | bosom board | 6 Dec 1881 |
| 622538 | Rice, Samuel J. | Scotch Grove | stock rack for platform scales | 4 Apr 1899 |
| 5632153 | Ricklefs, Raymond E. | Anamosa | system and process for cleansing brine in a food-chilling circuit | 27 May 1997 |
| 5331919 | Root, John | Anamosa | medication scheduling device | 26 Jul 1994 |
| 118975 | Ross, Oliver B. | Bowen’s Prairie | grain binder | 12 Sep 1871 |
| 201838 | Ross, Oliver B. | Monticello | gang cheese press | 26 Mar 1878 |
| 5878995 | Rundle, Paul E. | Wyoming | lifting device for concrete mixer vehicle drum | 9 Mar 1999 |
| 1492483 | Ryan, Charles W. | Anamosa | roof bracket | 29 Apr 1924 |
| 210150 | Rynerson, Robert A. | Bowen’s Prairie | combined land roller and clod crusher | 19 Nov 1878 |
| 88416 | Sackett, Matthew | Monticello | broadcast seeder | 30 Mar 1869 |
| 640594 | Sanford, Delano | Scotch Grove | crank wheel | 2 Jan 1900 |
| 6161650 | Sauser, Edwin J. | Monticello | lubricating system for a vibratory apparatus | 19 Dec 2000 |
| 107294 | Sawyer, Eli | Madison | marking attachment to corn planters | 13 Sep 1870 |
| 4165184 | Schlarmann, Philip J. | Scotch Grove | apparatus for asphaltic concrete hot mix recycling | 21 Aug 1979 |
| 4318619 | Schlarmann, Philip J. | Scotch Grove | method of and apparatus for asphaltic concrete hot mix recycling | 9 Mar 1982 |
| 1244904 | Scott, Addie G. | Anamosa | automobile garment | 30 Oct 1917 |
| 196543 | Scriven, Oliver G. | Langworthy | milking stool | 30 Oct 1877 |
| 522622 | Sears, George | Onslow | power shears | 10 Jul 1894 |
| 540275 | Sears, George | Onslow | combined punching, shearing, and tire upsetting machine | 4 Jun 1895 |
| 643167 | Sears, George | Onslow | combined punching, shearing, and plow welding machine | 13 Feb 1900 |
| 721841 | Sears, William T. | Onslow | metal working machine | 3 Mar 1903 |
| 900213 | Sears, William T. | Onslow | cutting, punching, and tire shrinking machine | 6 Oct 1908 |
| 1440414 | Seeger, Charlie | Morley | wind board for hay loaders | 2 Jan 1923 |
| 813242 | Seeger, Henry | Morley | nut lock | 20 Feb 1906 |
| 1267285 | Shanklin, Urban J. | Anamosa | releasing means | 21 May 1918 |
| 809991 | Sheridan, Frank | Anamosa | dustless attachment for brooms | 16 Jan 1906 |
| 1135065 | Shipley, Herman W. | Center Junction | rail tie and fastener | 13 Apr 1915 |
| 270021 | Shuman, M. Cole | Anamosa | measuring pump | 2 Jan 1883 |
| 3574320 | Sigmund, Donald F. | Anamosa | mulcher bar assembly | 13 Apr 1971 |
| 2557895 | Skelley, Arthur E. | Monticello | basket handle | 19 Jun 1951 |
| 340160 | Slauson, Daniel | Monticello | gate | 20 Apr 1886 |
| 6543292 | Smith, Bruce V. | Monticello | piezoresistive air pressure sensor | 8 Apr 2003 |
| 325456 | Smith, C. Haldridge | Anamosa | wall bracket | 1 Sep 1885 |
| 1492483 | Snyder, Clarence M. | Anamosa | roof bracket | 29 Apr 1924 |
| 351289 | Stadmueller, Mix F.E. | Castle Grove | washing machine | 19 Oct 1886 |
| 320188 | Stadtmuller, Max F.E. | Castle Grove | hay loader | 16 Jun 1885 |
| 2286586 | Starks, Benjamin | Monticello | cross wedge | 16 Jun 1942 |
| 472279 | Starks, John | Fairview | grubbing machine | 5 Apr 1892 |
| 923454 | Stearns, Dana L. | Martelle | vehicle jack and lifter | 1 Jun 1909 |
| 1257419 | Stimpson, Thomas Jr. | Anamosa | internal combustion motor | 26 Feb 1918 |
| 568378 | Stout, John S. | Oxford Junction | draw bar | 29 Sep 1896 |
| 845594 | Stout, John S. | Oxford Junction | snow plow | 26 Feb 1907 |
| 3143158 | Sundquist, Grant L. | Monticello | engine positioner and shaft straightener | 4 Aug 1964 |
| 6686818 | Svetanoff, Dale | Monticello | reverberation chamber tuner and shaft with electromagnetic radiation leakage device | 3 Feb 2004 |
| 1010980 | Tallman, Ellsworth | Morley | vehicle tire | 5 Dec 1911 |
| 2681454 | Tallman, John | Anamosa | vertically adjustable bed frame | 22 Jun 1954 |
| 2893192 | Tallman, John | Anamosa | central delivery hay rake | 7 Jul 1959 |
| 372500 | Tasker, Thomas G. | Onslow | cultivator | 1 Nov 1887 |
| 445267 | Tasker, Thomas G. | Wyoming | attachment for plows | 27 Jan 1891 |
| 6865477 | Taylor, Gordon A. | Anamosa | high resolution autonomous precision positioning system | 8 Mar 2005 |
| 1118701 | Teeter, Mahlon H. | Monticello | adjustable automobile pedal | 24 Nov 1914 |
| 6079366 | Telleen, Bruce A. | Monticello | removable dairy free stall base | 27 Jun 2000 |
| 1218129 | Templeman, James A. | Anamosa | lubricating device | 6 Mar 1917 |
| 247053 | Thoeni, Martin | Monticello | can | 13 Sep 1881 |
| 459716 | Thoeni, Martin | Monticello | combined band coupling and handle for cans | 15 Sep 1891 |
| 566817 | Thoeni, Martin | Monticello | milk cooling apparatus | 1 Sep 1896 |
| 1329150 | Thomas, Raymond G. | Monticello | method of and apparatus for measuring the heights of superposed liquids of varying specific gr | 27 Jan 1920 |
| 2598465 | Thomas, Raymond G. | Monticello | vapor injector | 27 May 1952 |
| 737884 | Thompson, John H.M. | Center Junction | cattle stanchion | 1 Sep 1903 |
| 3284041 | Tjaden, Owen G. | Monticello | holding device | 8 Nov 1966 |
| 135497 | Tomlinson, Joseph | Onslow | bolt cutter | 4 Feb 1873 |
| 135498 | Tomlinson, Joseph | Onslow | tire bender | 4 Feb 1873 |
| RE5409 | Tomlinson, Joseph | Onslow | improvement in machines for bending tires | 13 May 1873 |
| 80843 | Toof, Edwin J. | Madison | lamp burner | 11 Aug 1868 |
| 300663 | Trester, David Clinton | Anamosa | chimney cap | 17 Jun 1884 |
| 533402 | Trester, David C. | Anamosa | rope coupling | 29 Jan 1895 |
| 465221 | Tucker, Alfred B. | Monticello | kitchen cabinet | 15 Dec 1891 |
| 798933 | Tucker, Chalmer D. | Oxford Junction | automatic letter box alarm | 5 Sep 1905 |
| 907919 | Turner, Charles J. | Monticello | box lip clamp | 29 Dec 1908 |
| 1057901 | Turner, Charles J. | Monticello | wire stretcher | 1 Apr 1913 |
| 522622 | Underwood, William H. | Onslow | power shears | 10 Jul 1894 |
| 5498847 | Van Waart, Douglas | Anamosa | arc stack for a circuit breaker | 12 Mar 1996 |
| 5504292 | Van Waart, Douglas | Anamosa | arc stack for a circuit breaker | 2 Apr 1996 |
| 5817998 | Van Waart, Douglas Paul | Anamosa | circuit breaker with handle locking device | 6 Oct 1998 |
| 333363 | VanDelinder, Luther J. | Garfield | spring bed | 29 Dec 1885 |
| 5678961 | VanWaart, Douglas P. | Anamosa | quick change adapter | 21 Oct 1997 |
| 5902966 | VonMuenster, Ken | Anamosa | grain drill scales | 11 May 1999 |
| 1563124 | Wald, John R. | Anamosa | dies | 24 Nov 1925 |
| 1883836 | Wallace, Kieran | Clay Twp | tractor wheel lug | 18 Oct 1932 |
| 479040 | Warner, Henry F. | Monticello | speed governor attachment | 19 Jul 1892 |
| 479040 | Warner, William B. | Monticello | speed governor attachment | 19 Jul 1892 |
| 89718 | Weaver, Devolson | Anamosa | drive well point | 4 May 1869 |
| 639638 | Weber, Gustav A. | Monticello | clothes line fastener | 19 Dec 1899 |
| 2702182 | Wenger, Edward C. | Monticello | tie for fence posts | 15 Feb 1955 |
| 2659090 | Westfahl, William C. | Olin | portable bathtub | 17 Nov 1953 |
| 120690 | Williams, Henry D. | Fairview | ditching plow | 7 Nov 1871 |
| 168311 | Williams, John C. | Olin | harrow | 28 Sep 1875 |
| 1450934 | Wilson, Jesse E. | Oxford Junction | air confining and releasing valve | 10 Apr 1923 |
| 1861487 | Yeoman, William F. | Monticello | adjustable hayrack clamp | 7 Jun 1932 |
| 2029809 | Yeoman, William F. | Monticello | jar lifter | 4 Feb 1936 |
| 2029810 | Yeoman, William F. | Monticello | jar holder | 4 Feb 1936 |
| 272826 | Young, James | Monticello | apparatus for tightening tires | 20 Feb 1883 |
| 272826 | Young, Peter | Monticello | apparatus for tightening tires | 20 Feb 1883 |
| 3059444 | Zaruba, John P. | Anamosa | freezing apparatus | 16 Oct 1962 |
| 843250 | Zigler, Stephen S. | Oxford Junction | combined trousers stretcher and presser | 5 Feb 1907 |
|