Patent Explorer
Browse, filter, and analyze 8 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US4111047A | Hydrostatic head pressure monitor with remote readout | Hydril LLC | Expired / Lapsed | 1977-01-12 | 1978-09-05 | 1997-01-12 | 0.0 yrs | 11 | |
| US4082147A | Method and apparatus for a surface control system for: subsurface safety valves | Hydril LLC | Expired / Lapsed | 1977-02-24 | 1978-04-04 | 1997-02-24 | 0.0 yrs | 19 | |
| US4026583A | Stainless steel liner in oil well pipe | Hydril LLC | Expired / Lapsed | 1975-04-28 | 1977-05-31 | 1995-04-28 | 0.0 yrs | 6 | |
| US3924251A | Input signal powered converter | Hydril LLC | Expired / Lapsed | 1974-03-25 | 1975-12-02 | 1994-03-25 | 0.0 yrs | 5 | |
| US3763933A | Retrievable safety valve | Hydril LLC | Expired / Lapsed | 1971-04-06 | 1973-10-09 | 1991-04-06 | 0.0 yrs | 33 | |
| US3339632A | Underwater connector | Hydril LLC | Expired / Lapsed | 1964-01-21 | 1967-09-05 | 1984-01-21 | 0.0 yrs | 2 | |
| US3035808A | Pressure responsive valve | Hydril LLC | Expired / Lapsed | 1956-08-30 | 1962-05-22 | 1976-08-30 | 0.0 yrs | 0 | |
| US2038140A | Packing head | Hydril LLC | Expired / Lapsed | 1931-07-06 | 1936-04-21 | 1951-07-06 | 0.0 yrs | 0 |