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| Patents for William H. Welch | |||||
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| Number | Date | Patentee | Title | Type | |
| 139,984 | Jun. 17, 1873 | W.H. Welch | Coffee Roasters | coffee roasters | |
| 955,623 | Apr. 19, 1910 | W.H. Welch | Power Hammer | power hammers | |
| 2,105,237 | Jan. 11, 1938 | W.H. Welch | Metal Cutting Machine | metal shapers | |