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| Patents Granted on 1842-12-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,878 | Dec. 12, 1842 | W.L. Peters | Machine for mortising and tenoning | mortising machines | |
| GB-184,209,570 | Dec. 22, 1842 | R. Wilson | Improvements in locomotive and other steam-engines | steam engine valve gear | |
| 2,895 | Dec. 31, 1842 | W. Douglas, B. Douglas | Pump | household hand pumps | |
| 2,900 | Dec. 31, 1842 | J.T. Gilmore | Inclined Water Wheel | water wheels | |