| All Patents in class 81/438 |
Patents 1 -
15
of 50
      |
| Number | Date | Patentee | Title | Type |
| 157,102 | Nov. 24, 1874 | W.F. Patterson | Improvement in Screw-Drivers | screwdriver blades |
| 158,807 | Jan. 19, 1875 | W.F. Patterson | Improvement in Screw-Drivers | screwdriver blades |
| 204,812 | Jun. 11, 1878 | R.S. Gladding | Improvement in Screw-Drivers | screwdriver blades |
| 214,785 | Apr. 29, 1879 | E. Morris | Improvement in Screwdrivers | screwdriver handles |
| 219,425 | Sep. 09, 1879 | G. Abrams | Improvement in Crank Screw-Drivers | screwdriver mechanisms |
| 249,101 | Nov. 01, 1881 | H.A. Sawtell | Screw-Driver | screwdriver blades |
| 274,042 | Mar. 13, 1883 | H.V. Smith | Convertible screwdriver and borer | tool holders |
| 279,917 | Jun. 26, 1883 | F.J. Colvin | Screw-Driver | screwdriver blades |
| 346,603 | Aug. 03, 1886 | W.F. Patterson, H.B. Stillman | Multi-Blade Screw Driver | screwdriver blades |
| 386,263 | Jul. 17, 1888 | J.T. Pedersen | Tool Holder and Tools for the Same | |
| 456,341 | Jul. 21, 1891 | J. Reid, Jr. | Reversible Screwdriver | screwdriver handles |
| 484,654 | Oct. 18, 1892 | W.E. Daily | Screw-driver | eggbeater drills |
| 504,757 | Sep. 12, 1893 | A. Schuermann | Screwdriver | screwdriver blades |
| 510,104 | Dec. 05, 1893 | J. Uhl | Improvements in Bit-Stocks or Tools for Holding Screw-Hooks, or Like Articles | brace chucks |
| 624,875 | May 09, 1899 | W.D. Arnott, B.E. Sawyer | replaceable screwdriver blade | screwdriver blades |
