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| Patents for Edwin C. Henn | |||||
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| Number | Date | Patentee | Title | Type | |
| 470,497 | Mar. 08, 1892 | W.S. Loveland, E.C. Henn | Journal | metalworking machine mechanisms | |
| 530,179 | Dec. 04, 1894 | R. Hakewessell | Screw-making machine | screw machines | |
| 530,180 | Dec. 04, 1894 | E.C. Henn | Screw-making machine | screw machines | |
| 635,853 | Oct. 31, 1899 | E.C. Henn | Metal Working Machine | multiple spindle lathes | |
| 667,311 | Feb. 05, 1901 | E.C. Henn | Metal Turning Tool | lathe tools | |