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| Patents Granted on 1831-02-11 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,371X | Feb. 11, 1831 | E. Bigelow | Grist mill | grist mills | |
| 6,372X | Feb. 11, 1831 | J. Boston | Manufacturing gas | ||
| 6,373X | Feb. 11, 1831 | S.G. Chamberlain | Securing porcelain teeth | ||
| 6,374X | Feb. 11, 1831 | J. Cornell | Felting and napping hats | ||
| 6,375X | Feb. 11, 1831 | J. Harman, Jr. | Thrashing machine | threshers and thrashers | |
| 6,376X | Feb. 11, 1831 | S. Hornback | Machine for cutting sickles, files, etc. | files | |