| All Patents in class 266 |
Patents 31 -
45
of 72
      |
| Number | Date | Patentee | Title | Type |
| 1,253,966 | Jan. 15, 1918 | F.W. Harris | Process and Apparatus for Treating Drill Pipe | oilfield machinery |
| 1,265,944 | May 14, 1918 | C. Napier | Process of and Apparatus for Heat Treatment of Metal Objects | heat treating machines |
| 1,327,881 | Jan. 13, 1920 | C.H. Roth | Tool or Cutter Head | metal planer tool holders |
| 1,333,767 | Mar. 16, 1920 | C. Napier | Method of making tempered blades | making sawblades |
| 1,350,618 | Aug. 24, 1920 | C. Napier | Apparatus for making tempered blades | making sawblades |
| 1,495,994 | Jun. 03, 1924 | J. Farmer | Metal Burning Apparatus | torches |
| 1,769,053 | Jul. 01, 1930 | T.W. Clark | Furnace | |
| 1,866,827 | Jul. 12, 1932 | F.J. Vlchek | Manufacture of Swaged and Tempered Articles | metalworking machines |
| 1,906,092 | Apr. 25, 1933 | G.S. Peterson | Conveyer furnace | |
| 1,944,798 | Jan. 23, 1934 | W. Mellor | Means for Quenching Steels | |
| 2,129,463 | Sep. 06, 1938 | E.P. Bullard | Station Type Treatment Machine | |
| 2,157,948 | May 09, 1939 | H.H. Beeny | Hardening of Metal Surfaces | flame hardening machines |
| 2,208,879 | Jul. 23, 1940 | J.Y. Blazek, V.R. Roy | Grinder for clutch pressure-plates | clutch maintenance |
| 2,220,002 | Oct. 29, 1940 | H.M. Binns, W.A. Maddox, M. Rollman | Heat Treating | flame hardening machines |
| 2,245,273 | Jun. 10, 1941 | A.L. Hartley | Method of Flame Hardening Lathe Beds | metal lathes |
