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| Patents for Howard Roy Stacks | |||||
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| Number | Date | Patentee | Title | Type | |
| 835,373 | Nov. 06, 1906 | H.R. Stacks | Friction-clutch | industrial machine clutches | |
| 890,810 | Jun. 16, 1908 | H.R. Stacks | Friction-clutch | industrial machine clutches | |
| 924,397 | Jun. 08, 1909 | H.R. Stacks | Friction-clutch | industrial machine clutches | |