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| Patents Granted on 1831-04-18 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,487X | Apr. 18, 1831 | C. Adams | Chairs, coaches, etc. | ||
| 6,488X | Apr. 18, 1831 | S. Davis | Manufacturing hollow ware of zince | ||
| 6,489X | Apr. 18, 1831 | A. Greenleaf | Rotary steam engine | rotary steam engines | |
| 6,490X | Apr. 18, 1831 | J. Johnson | Life escape and fire ladder | ||
| 6,491X | Apr. 18, 1831 | A. Wolfe | Locks for doors | household tools | |