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| Patents for Wm. H. Chapin | |||||
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| Number | Date | Patentee | Title | Type | |
| 225,485 | Mar. 16, 1880 | E.N. Parker | Parallel Pliers | pliers | |
| 268,560 | Dec. 05, 1882 | J. Duckworth, E. Smith | Combination Tool | bevels | |
| 297,574 | Apr. 29, 1884 | L.L. Davis | Spirit Level | metallic levels | |
| 319,215 | Jun. 02, 1885 | C.P. Fay | Spring Calipers | gauges | |
| 530,468 | Dec. 04, 1894 | L.O. Barrett | Metal Marking Gage | marking gauges | |