| All Patents in class 81/438 |
Patents 31 -
43
of 43
      |
| Number | Date | Patentee | Title | Type |
| 2,378,775 | Jun. 19, 1945 | A.T. Johnson | Screw Driver | screwdriver mechanisms |
| D150,800 | Aug. 31, 1948 | J. Magnus, Jr. | Socket Screw Driver | screwdrivers |
| 2,476,762 | Jul. 19, 1949 | J.O. Olsen, J.N. Petre | Chuck | screwdriver mechanisms |
| 2,522,217 | Sep. 12, 1950 | L.J. Wendling, H.G. Fischer | Composite bit device for screw drivers and the like | screwdriver blades |
| 2,558,158 | Jun. 26, 1951 | G.L. Rock | Safety Tool Handle | tool handles |
| 3,114,401 | Dec. 17, 1963 | A.T. Johnson | Hand Tools of the Nature of Screwdrivers, Socket Wrenches and the Like | screwdriver mechanisms |
| 3,742,787 | Jul. 03, 1973 | C.L. Whiteford | Reversible drive ratchet hand tool with spherical handle | screwdrivers |
| 5,295,423 | Mar. 22, 1994 | F. Mikic | Bit with Frictional Retention in Drive Socket | |
| 5,343,786 | Sep. 06, 1994 | G.A. Wridt | Bit and Socket Combination | socket wrenches |
| 5,485,769 | Jan. 23, 1996 | G.E. Olson, G.A. Wridt | Square Drive Adapter | wrench sockets |
| 5,533,429 | Jul. 09, 1996 | B. Kozak | Fastener Driving Tool Insert | screwdriver mechanisms |
| 5,881,614 | Mar. 16, 1999 | H. Cheng-Tsan | Tool with reversible bit and method of assembly | screwdrivers |
| 5,904,080 | May 18, 1999 | P. Cassutti, W. Anderson | 8 in 1 Tool Bit Driver Hand Tool | screwdriver mechanisms |
