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| Patents for Oscar D. Hapgood | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,102,581 | Jul. 07, 1914 | O.D. Hapgood | Valve Grinder | valve grinding tools | |
| 1,166,364 | Dec. 28, 1915 | O.D. Hapgood | Tool | push drills | |
| 1,172,793 | Feb. 22, 1916 | O.D. Hapgood | Revolution Counter | measurement gauges | |
| 1,449,400 | Mar. 27, 1923 | O.D. Hapgood | Hand tool | screwdrivers | |
| 1,462,963 | Jul. 24, 1923 | O.D. Hapgood | Tool | breast drills | |
| 1,518,579 | Dec. 09, 1924 | O.D. Hapgood | Valve-grinding tool | ||
| 1,624,339 | Apr. 12, 1927 | O.D. Hapgood | Level | levels | |