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| Patents for David Hans Heynau | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,950,675 | Mar. 13, 1934 | D.H. Heynau | Friction gear for stepless changing the rotation of a driven shaft | industrial machine speed and direction changing mechanisms | |
| 2,032,015 | Feb. 25, 1936 | D.H. Heynau | Friction gear transmission | industrial machine speed and direction changing mechanisms | |
| 2,199,491 | May 07, 1940 | D.H. Heynau | Friction gear transmission | industrial machine speed and direction changing mechanisms | |