Shaffer Tool Works
Shaffer ToActive Patents
0
Total Holdings
6
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3590920A | Remote-controlled oil well pipe shear and shutoff apparatus | Expired / Lapsed | 1969-03-12 | 1971-07-06 | 12 | Details |
| US3074486A | Kick sub | Expired / Lapsed | 1958-04-22 | 1963-01-22 | 2 | Details |
| US3023012A | Submarine drilling head and blowout preventer | Expired / Lapsed | 1959-06-09 | 1962-02-27 | 0 | Details |
| US2995196A | Drilling head | Expired / Lapsed | 1957-07-08 | 1961-08-08 | 0 | Details |
| US2764431A | Casing-head adapter flange | Expired / Lapsed | 1952-12-05 | 1956-09-25 | 0 | Details |
| US2760750A | Stationary blowout preventer | Expired / Lapsed | 1953-08-13 | 1956-08-28 | 0 | Details |