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| Patents Granted on 1839-12-31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,457 | Dec. 31, 1839 | M. Andrews, J. Sproat | Manner of relieving the collars of circular saws from the friction occasioned by the article sawed | circular saws | |
| 1,458 | Dec. 31, 1839 | T.J. Butler | Mode of Cutting Seats, Slots, or Grooves for the Reception of Keys in the Hubs and Axles of Car-Wheels and in other Machinery | key seating machines | |