Patents for Thompson Grinder Co. |
Patents 1 -
10
of 90
      |
Picture | Number | Date | Patentee | Title |
| 1,978,181 | Oct. 23, 1934 | J.R. Whittles | Hydraulically driven surface grinding machine |
| 2,068,529 | Jan. 19, 1937 | W.G. Baldenhofer | Grinding Machine |
| 2,113,287 | Apr. 05, 1938 | W.G. Baldenhofer | Machine for Grinding and Sharpening Broaches |
| 2,131,151 | Sep. 27, 1938 | H.F. Smith | Grinding machines |
 | 2,138,811 | Dec. 06, 1938 | P.A. Abe | Surface Hardening Lathe Bed |
| 2,154,947 | Apr. 18, 1939 | H.H. Beeny, A.H. Lloyd | Hardening Metal Surfaces |
 | 2,157,948 | May 09, 1939 | H.H. Beeny | Hardening of Metal Surfaces |
| 2,216,308 | Oct. 01, 1940 | E.C. Ballman | Method and Means for Balancing Grinding Wheels |
| 2,216,800 | Oct. 08, 1940 | W.G. Baldenhofer | Hydraulic Control Device |
 | 2,231,233 | Feb. 11, 1941 | H. Vienhaus | Process of finishing materials |