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| Patents Granted on 1861-04-09 | |||||
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| Number | Date | Patentee | Title | Type | |
| 31,971 | Apr. 09, 1861 | J.O. Haight | Piston of steam-engines | piston ring and packing | |
| 31,987 | Apr. 09, 1861 | R.B. Light | Machinist's Square | squares | |
| 31,997 | Apr. 09, 1861 | T. Phillips | Handle for Hammers, &c. | hammer handles | |