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| Patents for Henry C. Knowlton | |||||
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| Number | Date | Patentee | Title | Type | |
| 177,018 | May 02, 1876 | O. Sawyer, A. Knowlton, H.C. Knowlton | Improvement in sanding-machines | sanding machines | |
| 327,203 | Sep. 29, 1885 | C.D. Smith | Planer for small curved pieces | wood planers | |
| 328,966 | Oct. 27, 1885 | L.G. McKnight, H.C. Knowlton | Boring-machine | chair maker | |
| 341,149 | May 04, 1886 | H.C. Knowlton | Cutter-head | cutterheads | |