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| Patents for William Powell Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 159,962 | Feb. 16, 1875 | J. Powell | Lubricator for Steam Engines | oil cups | |
| 326,517 | Sep. 15, 1885 | J. Powell | Lubricator | oil cups | |
| 326,518 | Sep. 15, 1885 | J. Powell | Lubricator | oil cups | |
| 326,519 | Sep. 15, 1885 | J. Powell | Lubricator | oil cups | |
| 326,521 | Sep. 15, 1885 | J. Powell | Lubricator | oil cups | |
| 463,320 | Nov. 17, 1891 | J. Powell | Lubricator | steam engine lubricators | |
| 604,265 | May 17, 1898 | J. Powell | Lubricator | oil pumps | |