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| Patents Granted on 1831-02-18 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,387X | Feb. 18, 1831 | L. Disbrow | Compound furnace steam boiler | stationary boilers | |
| 6,388X | Feb. 18, 1831 | J. Eastman | Double rotary steam engine | steam engines | |
| 6,389X | Feb. 18, 1831 | J. Eastman | Water wheel with floats working upon hinges | water wheels | |