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| Patents for Howard D. Corwin | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,438,991 | Dec. 19, 1922 | W.R. Fox, H.D. Corwin | Pipe cutter | ||
| 1,453,008 | Apr. 24, 1923 | W.R. Fox, H.D. Corwin | Multiple-drilling machine | ||
| 1,489,523 | Apr. 08, 1924 | W.R. Fox, H.D. Corwin | Drilling machine (multiple drill) | ||
| 1,550,609 | Aug. 18, 1925 | W.R. Fox, H.D. Corwin | Metal-working machine | ||
| 1,754,621 | Apr. 15, 1930 | W.R. Fox, H.D. Corwin | Tapping or like machine | ||