| Patents for Pratt & Whitney Co. |
Patents 16 -
30
of 264
      |
| Number | Date | Patentee | Title | Type |
| 170,949 | Dec. 14, 1875 | J.J. Grant | Improvement in screw-cutting die holders | tap wrenches and die stocks |
| 172,854 | Feb. 01, 1876 | J.J. Grant | Improvement in Tap-Wrenches | tap wrenches and die stocks |
| 173,780 | Feb. 22, 1876 | J.J. Grant | Improvement in screw-cutting dies | taps and dies |
| 176,683 | Apr. 25, 1876 | J. Renshaw | Ratchet Drill | ratchet drills |
| 189,057 | Apr. 03, 1877 | J.R. Reynolds, F.A. Pratt | Improvement in machines for varnishing the interior of cartridge-shells | cartridges |
| 204,028 | May 21, 1878 | F.N. Gardner, N. Sawyer, J.J. Grant | Improvement in screw-cutting dies | taps and dies |
| 231,607 | Aug. 24, 1880 | E.G. Parkhurst | Machine-gun | firearms |
| 241,236 | May 10, 1881 | F.A. Pratt | Adjustable lever | cranes |
| 241,563 | May 17, 1881 | F.A. Pratt | Metal-planing machine | metal planers |
| 248,587 | Oct. 25, 1881 | W. Gray | Device for Throwing Belts Onto or Off From Revolving Pulleys | belt shifters |
| 256,165 | Apr. 11, 1882 | J.R. Reynolds | Machine for Cutting Grooves in Rolls | metal planer accessories |
| 259,040 | Jun. 06, 1882 | E.G. Parkhurst | Ammunition-box | |
| 275,431 | Apr. 10, 1883 | C.M. Spencer | Metal Screw Machine | screw machines |
| 290,612 | Dec. 18, 1883 | W.W. Tucker | Knurling-tool | lathe tools |
| 298,979 | May 20, 1884 | M.C. Johnson | Friction Clutch | industrial machine clutches |
