| Patents Granted on 1839-12-__ |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| XC-50 | Dec. 04, 1839 | W. Nunns | Certain new and useful improvements in the construction of steam engines | steam engines |
| GB-183,908,299 | Dec. 04, 1839 | J. Nasmyth | Railway-carriage brakes | railroad car brakes |
| RX-18 | Dec. 10, 1839 | W.H. Mackrell | Improvement in Fasteners for Shutters and Blinds | shutters and blinds |
| 1,443 | Dec. 27, 1839 | H. Aiken | Tool Handle | tool holders |
| 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 |
