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| Patents for R. A. Chapman | |||||
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| Picture | Number | Date | Patentee | Title | |
 | RE38 | May 17, 1842 | S. Merrick | Improvement in Screw Wrenches | |
 | RX-38 | May 17, 1842 | S. Merrick | Improvement in the Screw Wrenches | |
 | 5,435 | Feb. 08, 1848 | S. Merrick | Improvement in revolving Spring Punches | |
 | 12,747 | Apr. 17, 1855 | C. Van Horn | Slide Rest for Lathes | |