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| Patents for William Trapp | |||||
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| Number | Date | Patentee | Title | Type | |
| 28,701 | Jun. 12, 1860 | W. Trapp | Stave-machine | cooper | |
| 43,933 | Aug. 23, 1864 | W. Trapp | Improvement in machines for dressing heads to barrels | cooper | |
| 43,934 | Aug. 23, 1864 | W. Trapp | Improvement in machines for dressing staves to barrels | cooper | |
| 43,935 | Aug. 23, 1864 | W. Trapp | Improvement in machine for jointing headings for barrels | cooper | |