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