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| Patents for Henry H. Gridley | |||||
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| Number | Date | Patentee | Title | Type | |
| 54,330 | May 01, 1866 | H.H. Gridley | Improvement in head-blocks to sawmills | sawmill headblocks | |
| 75,678 | Mar. 17, 1868 | H.H. Gridley | Improvement in sawmills | sawmill carriages | |
| 106,932 | Aug. 30, 1870 | H.H. Gridley | Improvement in head-block | sawmill headblocks | |