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| Patents Granted on 1831-05-03 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,534X | May 03, 1831 | J.F. Anderson | Grist mill | grist mills | |
| 6,535X | May 03, 1831 | P.C. Curtis | Steam engine boiler | stationary boilers | |
| 6,536X | May 03, 1831 | M. Hurd | Machine for grinding bark | bark processing machines | |
| 6,537X | May 03, 1831 | U.B. Lange | Stove for stone coal | stoves | |
| 6,538X | May 03, 1831 | J. Perkins | Soda water apparatus | ||
| 6,539X | May 03, 1831 | W. Manning | Machine for cutting grass and grain | ||