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| Patents Granted on 1831-07-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,657X | Jul. 21, 1831 | W.A. Turner | Steam engine machinery | steam engines | |
| 6,658X | Jul. 21, 1831 | S.W. Allen | Double piston pump | pumps | |
| 6,659X | Jul. 21, 1831 | N.P. Stanton | Thrashing Machine | animal powered apparatus | |
| 6,660X | Jul. 21, 1831 | J.R. Post | Window and door fastenings | ||
| 6,661X | Jul. 21, 1831 | J. Kendall, Jr. | Metallic mould for casting butt hinges | patternmaker | |