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| Patents for John P. Holt | |||||
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| Number | Date | Patentee | Title | Type | |
| 70,213 | Oct. 29, 1867 | J.P. Holt | Steam Gauge | steam pressure gauges | |
| 129,958 | Jul. 30, 1872 | J.P. Holt | Improvement in Registering Steam-Gauges | steam pressure gauges | |
| 219,640 | Sep. 16, 1879 | J.P. Holt | Portable Forge | portable forges | |
| 280,824 | Jul. 10, 1883 | J.P. Holt | Portable forge | forging machines | |
| 394,857 | Dec. 18, 1888 | J.P. Holt | Anvil and vise attachment | anvil vises | |
| CA-31,850 | Aug. 01, 1889 | J.P. Holt | Combined anvil and vise | anvil vises | |