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| Patents Granted on 1816-04-23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,571X | Apr. 23, 1816 | D. French | Turning buttons | ||
| 2,572X | Apr. 23, 1816 | B. Kugler | Making carburated hydrogen gas | ||
| 2,573X | Apr. 23, 1816 | J. Sargeant | Reconductor | ||
| 2,574X | Apr. 23, 1816 | S. Trumbull | Spring Bolt for Windows, Doors, Etc. | door springs | |