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| Patents for Porter A. Gladwin | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 17,541 | Jun. 09, 1857 | P.A. Gladwin | Tonguing and Grooving Hand-Plane | |
 | 19,359 | Feb. 16, 1858 | P.A. Gladwin | Method of Securing the Plane-Iron to its Stock | |
 | 185,442 | Dec. 19, 1876 | P.A. Gladwin | Improvement in Match-Planes | |
 | 202,105 | Apr. 09, 1878 | P.A. Gladwin | Combination Plane and Tool Handle | |
 | 248,854 | Nov. 01, 1881 | P.A. Gladwin | Auger Bit with Cross-Channel Lead Screw | |
 | 269,406 | Dec. 19, 1882 | P.A. Gladwin | Auger | |
 | 287,271 | Oct. 23, 1883 | P.A. Gladwin | Bench Vise | |