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| Patents for William H. Powell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 284,580 | Sep. 04, 1883 | W.G. Vernon | Band saw machine | |
| 349,833 | Sep. 28, 1886 | B.F. Asper | Chain-saw | ||
 | 865,811 | Sep. 10, 1907 | W.H. Powell | System of motor control | |
 | 865,813 | Sep. 10, 1907 | W.H. Powell | Methods and means for controlling electric motors | |
 | 865,814 | Sep. 10, 1907 | W.H. Powell | Motor-control system | |
 | 865,816 | Sep. 10, 1907 | W.H. Powell | Motor-control system | |
 | 1,051,821 | Jan. 28, 1913 | W.H. Powell | Dynamo-electric machine | |