Parkersburg Rig and Reel Co
ParkersburActive Patents
0
Total Holdings
8
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3065704A | Pump actuating systems | Expired / Lapsed | 1959-06-01 | 1962-11-27 | 0 | Details |
| US2560092A | Sealing means for bolted storage tanks | Expired / Lapsed | 1948-02-17 | 1951-07-10 | 0 | Details |
| US2211282A | Liquid transferring apparatus | Expired / Lapsed | 1938-01-27 | 1940-08-13 | 0 | Details |
| US2198744A | Pitman connection | Expired / Lapsed | 1936-10-24 | 1940-04-30 | 0 | Details |
| US1992910A | Brake system for drilling equipment | Expired / Lapsed | 1930-08-18 | 1935-02-26 | 0 | Details |
| US1985889A | Method and apparatus for controlling resistance of hydrodyn… | Expired / Lapsed | 1932-03-22 | 1935-01-01 | 0 | Details |
| US1943191A | Fabricated tank | Expired / Lapsed | 1933-02-16 | 1934-01-09 | 0 | Details |
| US1656992A | Reenforcing sleeve for tubular shafts | Expired / Lapsed | 1926-04-14 | 1928-01-24 | 0 | Details |