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| Patents for Henry C. Heckendorn | |||||
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| Number | Date | Patentee | Title | Type | |
| 201,781 | Mar. 26, 1878 | H.C. Heckendorn | Improvement in oval-turning lathes | wood lathes | |
| 220,145 | Sep. 30, 1879 | H.C. Heckendorn | Planer-Chuck | metal planer accessories | |
| 222,901 | Dec. 23, 1879 | H.C. Heckendorn | Improvement in oval-lathes | wood lathes | |
| 233,753 | Oct. 26, 1880 | H.C. Heckendorn | Lathe for turning ovals | wood lathes | |