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| Patents Granted on 1815-04-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,291X | Apr. 12, 1815 | W. Lawrence | Pin lathe for buttons | button making machinery | |
| 2,292X | Apr. 12, 1815 | J.B. Collins | Improvement in the old single jointed pewter button mould for casting wire-eyed buttons | ||
| 2,293X | Apr. 12, 1815 | J. Nichols, Jr. | Preparing colors with lime | ||