| Patents for John M. Hargrave |
Patents 1 -
15
of 16
      |
| Number | Date | Patentee | Title | Type |
| 1,161,210 | Nov. 23, 1915 | J.M. Hargrave | Work-holding jaw | bar and pipe clamps |
| 1,201,461 | Oct. 17, 1916 | J.M. Hargrave | Work-holding clamp | bar and pipe clamps |
| 1,456,692 | May 29, 1923 | J.M. Hargrave | Ratchet hand tool | screwdriver handles |
| 1,580,197 | Apr. 13, 1926 | J.M. Hargrave | Clamp | saw vises |
| CA-268,829 | Mar. 08, 1927 | J.M. Hargrave | Clamp | bar and pipe clamps |
| 1,638,848 | Aug. 16, 1927 | J.M. Hargrave | Clamp | bar and pipe clamps |
| 1,639,561 | Aug. 16, 1927 | J.M. Hargrave, D.L. Farmer | Clamp | bar and pipe clamps |
| 1,708,617 | Apr. 09, 1929 | J.M. Hargrave | Clamp jaw | bar and pipe clamps |
| 1,881,535 | Oct. 11, 1932 | J.M. Hargrave | Rock drill bit | drill bits |
| 1,918,469 | Jul. 18, 1933 | J.M. Hargrave | Clamp and method of manufacturing the same | C clamps |
| 1,930,343 | Oct. 10, 1933 | J.M. Hargrave | Clamp tightening machine | clamp carriers |
| 2,016,088 | Oct. 01, 1935 | J.M. Hargrave | c clamp | C clamps |
| 2,245,089 | Jun. 10, 1941 | J.M. Hargrave | Welder's clamp | welder |
| 2,519,652 | Aug. 22, 1950 | J.M. Hargrave | Spring clamp with adjustable clamping force | spring clamps |
| 2,667,678 | Feb. 02, 1954 | J.M. Hargrave | Hand clamps | spring clamps |
