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| Patents Granted on 1827-03-07 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,699X | Mar. 07, 1827 | J.H. Hall | Machine for cutting metallic and other hard surfaces | metalworking machines | |
| 4,700X | Mar. 07, 1827 | J. Rainey | Spring hammer for blacksmiths | blacksmith | |
| 4,701X | Mar. 07, 1827 | L. Matthey | Composition for making marbles, granites, etc. | ||