| Patents for Pratt & Whitney Co. |
Patents 46 -
60
of 261
      |
| Number | Date | Patentee | Title | Type |
| 385,543 | Jul. 03, 1888 | A. Burritt | Tap with Detachable Cutters | taps and dies |
| 390,108 | Sep. 25, 1888 | A. Whitney | Center Drilling Machine | center drilling machines |
| 390,190 | Sep. 25, 1888 | F.H. Richards | Turret-lock | turret lathes |
| 402,510 | Apr. 30, 1889 | C.H. Cooley | Valve Operating Mechcanism for Grain Scales | grain scales |
| 403,988 | May 28, 1889 | C.H. Cooley | Automatic Grain Scales | grain scales |
| 408,192 | Jul. 30, 1889 | F.H. Richards | Stop Motion Register for Grain Scales | grain scales |
| 414,357 | Nov. 05, 1889 | J.E. Woodbridge | Screw Cutting Tool | taps and dies |
| 421,556 | Feb. 18, 1890 | C.H. Cooley | Automatic regulator for grain-scales | |
| 421,773 | Feb. 18, 1890 | T.L. Smith | Screw Cutting Die | taps and dies |
| 434,702 | Aug. 19, 1890 | F.H. Richards, C.H. Cooley | Grain-weigher | |
| 434,723 | Aug. 19, 1890 | F.H. Richards | Regulator for Grain Weighers | grain scales |
| 440,740 | Nov. 18, 1890 | F.H. Richards, C.H. Cooley | Scale-beam for grain-weighers | |
| 442,640 | Dec. 16, 1890 | F.H. Richards | Regulator for grain-scales | |
| 442,711 | Dec. 16, 1890 | F.H. Richards | Regulator for grain-scales | |
| 442,712 | Dec. 16, 1890 | F.H. Richards | Grain-weigher | |
