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| Patents for John H. Westcott | |||||
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| Number | Date | Patentee | Title | Type | |
| 136,349 | Feb. 25, 1873 | J.H. Westcott | Improvement in chucks | metal lathe chucks | |
| 159,989 | Feb. 16, 1875 | J.H. Westcott | Improvement in chucks | metal lathe chucks | |
| 308,541 | Nov. 25, 1884 | J.H. Westcott | Chuck | metal lathe chucks | |
| 335,982 | Feb. 09, 1886 | J.H. Westcott | Lathe-chucks | metal lathe chucks | |
| 357,437 | Feb. 08, 1887 | J.H. Westcott | Lathe-chuck | metal lathe chucks | |