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| Patents for Lyman H. Essex | |||||
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| Number | Date | Patentee | Title | Type | |
| 250,464 | Dec. 06, 1881 | J. Thomson | Differential screw | bench vises | |
| 256,867 | Apr. 25, 1882 | J. Thomson | Improved Monkey Wrench | quick adjust wrenches | |
| 259,603 | Jun. 13, 1882 | J. Thomson | Bench Vise | vises | |
| 292,874 | Feb. 05, 1884 | J. Thomson | Bench Vise | vises | |