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| Patents for Frank M. Underwood | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 274,099 | Mar. 20, 1883 | J. Ackerman, A.O. Mitchell, F.M. Underwood | Saw-mill dog | |
| 306,038 | Sep. 30, 1884 | F.M. Underwood | Saw-mill dog | ||
| 542,743 | Jul. 16, 1895 | F.M. Underwood | Cylinder Head for Gas or Gasoline Engines | ||
| 553,181 | Jan. 14, 1896 | F.M. Underwood | Sparker for Gas and Gasoline Engines | ||
| 574,183 | Dec. 29, 1896 | F.M. Underwood | Mixer for Gas Engines | ||