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| Patents Granted on 1851-04-01 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,012 | Apr. 01, 1851 | J. Walker | Lock Former | tinsmith | |
| 8,017 | Apr. 01, 1851 | H. Mellish | Splint-machine | match making machines | |
| 8,019 | Apr. 01, 1851 | W. Campbell, H. Gross | Improvement in Machines for Cutting Screws on Bedstead-Rails | wood threading machines | |