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| Patents for William Trapp Jr. | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,218 | Oct. 01, 1845 | W. Trapp, Jr. | Barrel machinery | cooper | |
| 4,460 | Apr. 18, 1846 | W. Beach | Corn Sheller | corn shellers | |
| RE132 | Mar. 10, 1849 | W. Trapp, Jr. | Improvement in barrel machinery | cooper | |
| RE1,946 | May 02, 1865 | W. Trapp, Jr. | Improvement in barrel-machinery | cooper | |
| RE1,947 | May 02, 1865 | W. Trapp, Jr. | Improvement in barrel-machinery | cooper | |