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| Patents for H. G. Underwood | |||||
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| Number | Date | Patentee | Title | Type | |
| 588,991 | Aug. 31, 1897 | D.A. Henderson | Pipe Wrench | pipe tongs | |
| 598,671 | Feb. 08, 1898 | C.H. Driver | Sandpapering-machine | sanding machines | |
| 631,976 | Aug. 29, 1899 | D.J. Whittemore | Level for Tracks | levels | |
| 649,972 | May 22, 1900 | T.S. Watson | Electric-motor-controlling device | dental apparatus | |