| Ross | George | means for attaching the ends of posts to concrete bases | 953060 | Grinnell | 1910 |
| Baird | Charles | veterinary impregnating instrument | 945739 | Deep River | 1910 |
| Bates | Oliver | igniter gear for explosive engines | 946816 | Tilton | 1910 |
| Flaig | Joseph | tie | 1011335 | Brooklyn | 1911 |
| Wells | Elmer | stay iron | 991573 | Grinnell | 1911 |
| Hicks | Elmer | belt holder for engines | 1013388 | Montezuma | 1912 |
| Hicks | Clarence | belt holder for engines | 1013388 | Montezuma | 1912 |
| Zirbel | Carl | coin controlled mechanism | 1048263 | Montezuma | 1912 |
| Zirbel | Carl | air motor gear | 1015921 | Montezuma | 1912 |
| Meredith | William | game apparatus | 1035029 | Searsboro | 1912 |
| Lewis | George | gearing for washing machines | 1119438 | Grinnell | 1914 |
| Lewis | George | clothes wringer | 1107676 | Grinnell | 1914 |
| James | Arthur | attachment for shovels and spades | 1109758 | Searsboro | 1914 |
| Seth | John | boiler | 1093733 | Brooklyn | 1914 |
| Lewis | George | dolly shaft bearing for washing machines | 1113452 | Grinnell | 1914 |
| Lewis | George | gearing device for washing machines and wringers | 1116087 | Grinnell | 1914 |
| Craver | Stephen | fan attachment for cultivators | 1123854 | Searsboro | 1915 |
| Hakeman | Edgar | sliding gate | 1149823 | Hartwick | 1915 |
| Lewis | George | gearing device for washing machines | 1203883 | Grinnell | 1916 |
| Marvin | Joseph | valve for internal combustion engines | 1206237 | Malcom | 1916 |
| Lewis | George | wringer | 1208339 | Grinnell | 1916 |
| Wilson | William | clip | 1200287 | Grinnell | 1916 |
| Kilmer | William | proportionate feeding device for concrete mixers | 1247409 | Brooklyn | 1917 |
| Marshall | Ernest | lifing jack | 1223995 | Montezuma | 1917 |
| Viele | Byron | bearing cooling device | 1236238 | Grinnell | 1917 |
| Talley | Edwin | apparatus for purifying water | 1217365 | Grinnell | 1917 |
| Robinson | William | landing chassis for aeroplanes | 1240371 | Grinnell | 1917 |
| Robinson | William | aeroplane fuselage structure | 1222140 | Grinnell | 1917 |
| Kurtz | Cyrus | electric mechanism for starting automobiles and the like | 1230175 | Grinnell | 1917 |
| Hink | Charles | electromagnetic valve grinder | 1230900 | Grinnell | 1917 |
| Lewis | George | gearing device | 1211723 | Grinnell | 1917 |
| Lewis | George | gearing device for washing machines | 1231918 | Grinnell | 1917 |
| Talley | Edwin | massage apparatus | 1212845 | Grinnell | 1917 |
| Kilmer | William | chalk line reel | 1234347 | Brooklyn | 1917 |
| McConnell | Daniel | cultivator attachment | 1214337 | Malcom | 1917 |
| Robinson | William | aeroplane rib | 1214955 | Grinnell | 1917 |
| Lewis | George | washing machine | 1262962 | Grinnell | 1918 |
| Keister | Archibald | artificial bait | 1272812 | Grinnell | 1918 |
| Roach | Samuel | compound tool | 1276961 | Grinnell | 1918 |
| Lewis | George | centrifugal extractor | 1253987 | Grinnell | 1918 |
| Evans | Guy | leaf turner | 1266437 | Grinnell | 1918 |
| Cratty | Charles | dust cap | 1267636 | Grinnell | 1918 |
| Talley | Edwin | artificial rubber | 1285463 | Grinnell | 1918 |
| Livezey | Albert | trap | 1259641 | Grinnell | 1918 |
| Lewis | George | wringer | 14683 | Grinnell | 1919 |
| Owen | Archie | pump jack | 1349094 | Malcom | 1920 |
| Lewis | George | wringer | 1327766 | Grinnell | 1920 |
| Viele | Byron | turntable | 1355722 | Grinnell | 1920 |
| Larson | Arvid | radial engine | 1394419 | Grinnell | 1921 |
| Dolezal | John | non-leak cap for gasolene tanks | 1380045 | Guernsey | 1921 |
| Shaul | Charles | punching and cutting pliers | 1381024 | Grinnell | 1921 |
| Livezey | Albert | guardian rat trap | 1399630 | Grinnell | 1921 |
| Beatty | Thaddeus | chicken roost | 1371216 | Grinnell | 1921 |
| Lewis | George | clothes wringer | 1411443 | Grinnell | 1922 |
| Shedenhelm | Robert | conveyer device | 1477776 | Grinnell | 1923 |
| Chapman | Charles | hay derrick | 1461307 | Grinnell | 1923 |
| Larson | Arvid | fuel feeding device for internal combustion engines | 1451228 | Grinnell | 1923 |
| Shedenhelm | Robert | self loading and distributing wagon | 1442980 | Grinnell | 1923 |
| Lewis | George | agitator for washing machines | 1493786 | Grinnell | 1924 |
| Meyer | John | corn husker | 1479396 | Malcom | 1924 |
| Ricker | Benjamin | glove or mitten structure | 1488133 | Grinnell | 1924 |
| Weber | Joseph | waterer | 1566176 | Grinnell | 1925 |
| Bonyata | Charles | bubble forming and blowing device | 1545732 | Grinnell | 1925 |
| Souter | John | washing machine | 1555720 | Grinnell | 1925 |
| Zirbel | Carl | cream skimmer for milk bottles | 1598230 | Montezuma | 1926 |
| Lewis | George | wringer | 1580378 | Grinnell | 1926 |
| Shedenhelm | Robert | power operated material loading, conveying, and discharging machine | 1584042 | Grinnell | 1926 |
| Myerly | Glen | wagon end gate and scoop board combined | 1587978 | Deep River Township, Poweshiek County | 1926 |
| Montei | August | window washing rack | 1609657 | Malcom | 1926 |
| Slater | John | boiler | 1594127 | Grinnell | 1926 |
| Breeden | Alfred | lawn sweeper | 1615928 | Grinnell | 1927 |
| Lannom | Sharp | baseball center | 1636518 | Grinnell | 1927 |
| Farmer | Isaac | reversible disk sharpening tongs | 1625199 | Montezuma | 1927 |
| Kelm | Otto | damper | 1648182 | Malcom | 1927 |
| Breeden | Alfred | catcher attachment for lawn sweepers and the like | 1664659 | Grinnell | 1928 |
| Kelm | Otto | weed and vine destroyer | 1688463 | Malcom | 1928 |
| Martin | Howard | shore | 1797616 | Grinnell | 1931 |
| Douglass | Andrew | operating board | 1801907 | Malcom | 1931 |
| Walker | Elsie | jar holder | 1826486 | Deep River | 1931 |
| Shaffer | Charles | end gate for trucks and other vehicles | 1828450 | Deep River | 1931 |
| Breeden | Alfred | buncher attachment for combined harvesters and thrashers | 1844344 | Grinnell | 1932 |
| Lewis | George | wringer | 1894595 | Grinnell | 1933 |
| Hink | Charles | wheel aligner | 1970092 | Grinnell | 1934 |
| Shaffer | Charles | hot air heating system | 1966360 | Deep River | 1934 |
| Lannom | George | blind stitch play ball | 2101473 | Grinnell | 1937 |
| Barr | Samuel | oil burner | 2275002 | Malcom | 1942 |
| Stimson | Edgar | nesting device | 2279147 | Malcom | 1942 |
| Smith | Orville | combination bed and carriage | 2281209 | Grinnell | 1942 |
| Zirbel | Carl | bait applicator | 2458671 | Montezuma | 1949 |
| Bell | Dale | collapsible net-carrying structure | 2491703 | Grinnell | 1949 |
| Smith | Glen | receptacle filling device | 2534997 | Grinnell | 1950 |
| Danforth | Joseph | resinous condensation products from an aldehyde or a ketone and N-alkenylarylamine | 2495890 | Grinnell | 1950 |
| Dunforth | Joseph | production of aliphatic amines | 2518528 | Grinnell | 1950 |
| Peters | Austin | straddle type trailer cart | 2536567 | Montezuma | 1951 |
| Peters | Melvin | straddle type trailer cart | 2536567 | Montezuma | 1951 |
| Danforth | Joseph | drying oil compositions | 2566515 | Grinnell | 1951 |
| Nuckolls | Richard | audio level indicator | 2575358 | Grinnell | 1951 |
| Van Donselaar | Henry | trenching machine | 2579025 | Grinnell | 1951 |
| Reynolds | John | union overall garment construction | 2585840 | Grinnell | 1952 |
| Ryan | Warren | bale loader | 2594221 | Grinnell | 1952 |
| Doonon | John | mowing machine divider plate with divider rod attached thereto | 2645076 | Brooklyn | 1953 |
| Houston | John | hole digger | 2645457 | Grinnell | 1953 |
| Rodgers | Henry | tape dispenser | 2663510 | Grinnell | 1953 |
| Stratton | Frank | method and apparatus for molding strips of foamed latex | 2688158 | Grinnell | 1954 |
| Danforth | Joseph | dehydrogenation of naphthenes by means of sulfur dioxide | 2720550 | Grinnell | 1955 |
| Ahrens | Claude | supporting frame for a playground swing | 174847 | Grinnell | 1955 |
| Ahrens | Claude | playground climber | 176999 | Grinnell | 1956 |
| Bucksbaum | Arnold | means of coupling energy to from a coaxial resonator | 2771516 | Grinnell | 1956 |
| Vilder | Arthur | leveling attachment for farm implement hitches | 2747884 | Brooklyn | 1956 |
| Nicklas | Julius | poultry feeder | 2783739 | Guernsey | 1957 |
| Danforth | Joseph | process for treatment of gels | 2813079 | Grinnell | 1957 |
| Hutchinson | Wayne | boat propelling device | 2826164 | Montezuma | 1958 |
| Ahrens | Claude | playground see saw | 184552 | Grinnell | 1959 |
| McMullin | Harold | air suspension means for vehicles | 2916298 | Brooklyn | 1959 |
| Ahrens | Claude | climber slide | 186175 | Grinnell | 1959 |
