| All Patents in class 81/450 |
Patents 1 -
10
of 10
      |
| Number | Date | Patentee | Title | Type |
| 139,069 | May 20, 1873 | C. Law | Improvement in Screw Drivers | screwdriver blades |
| 778,945 | Jan. 03, 1905 | A.T. Bishop | Folding Tool | screwdriver handles |
| 821,328 | May 22, 1906 | H.D. Bartlett | Hand-Operated Tool | screwdriver handles |
| 1,000,051 | Aug. 08, 1911 | W.S. Thomson | Screw Driver Having Adjustable Handle | screwdriver handles |
| 1,128,165 | Feb. 09, 1915 | H.B. Mace | Tool Holder | tool handles |
| 1,239,847 | Sep. 11, 1917 | G. Townill | Universal Screw-Driver | screwdriver mechanisms |
| 1,398,234 | Nov. 29, 1921 | H.A. Landis | Variable Angle Screwdriver | screwdriver mechanisms |
| 1,558,763 | Oct. 27, 1925 | A.L. Rossberg | Angularly-Adjustable Tool Holder | screwdriver mechanisms |
| 1,642,569 | Sep. 13, 1927 | B. Reader, F.H. Winslow | Hand Tool | screwdriver mechanisms |
| 5,450,775 | Sep. 19, 1995 | B. Kozak | Multi-Function Driving Tool | screwdriver mechanisms |
