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| Patents for Hartford Tool Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 243,770 | Jul. 05, 1881 | J.E. Woodbridge, F.N. Gardner | Holder for Grinding Tools | grinding attachments | |
| 256,668 | Apr. 18, 1882 | F.N. Gardner | Cutter Holder for Lathes | lathe tool holders and tool posts | |
| 262,878 | Aug. 15, 1882 | J.E. Woodbridge | Metal Turning Tool | lathe tools | |
| 349,840 | Sep. 28, 1886 | F.N. Gardner | Drafting Compass | compasses | |
| 390,604 | Oct. 02, 1888 | M.C. Johnson | Lathe-tool | lathe tools | |