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| Patents for Howard E. Darby | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,765,592 | Jun. 24, 1930 | H.E. Darby, D.C. Klausmeyer | Single Lever Eight-Speed Shift Mechanism | metalworking speed changing mechanisms | |
| 2,193,279 | Mar. 12, 1940 | W.F. Groene, H.C. Kemper, H.E. Darby | Lathe headstock | metal lathe mechanisms | |
| 2,247,491 | Jul. 01, 1941 | H.E. Darby, H.C. Kemper, W.F. Groene | Transmission Shifter Mechanism | metalworking machine mechanisms | |