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| Patents for John Simpson | |||||
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| Number | Date | Patentee | Title | Type | |
| 97,712 | Dec. 07, 1869 | J. Simpson | Improvement in Vises for Wood Working | ||
| 119,658 | Oct. 03, 1871 | J. Simpson | Improvement in vises | woodworkers vises | |
| RE4,637 | Nov. 14, 1871 | J. Simpson | Woodworking vise | woodworkers vises | |
| 124,091 | Feb. 27, 1872 | J. Simpson | Improvement in Boring Machines | vertical boring mills | |