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Hydril LLC
Hydril LLCActive Patents
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Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US4294314A | Inside blowout preventer well tool | Expired / Lapsed | 1979-12-31 | 1981-10-13 | 8 | Details |
| US4244607A | Cylindrical threaded connection | Expired / Lapsed | 1979-01-02 | 1981-01-13 | 16 | Details |
| US4192533A | Dovetail connection for pin and box joints | Expired / Lapsed | 1978-02-06 | 1980-03-11 | 10 | Details |
| US4111047A | Hydrostatic head pressure monitor with remote readout | Expired / Lapsed | 1977-01-12 | 1978-09-05 | 11 | Details |
| US4082147A | Method and apparatus for a surface control system for: subs… | Expired / Lapsed | 1977-02-24 | 1978-04-04 | 19 | Details |
| US4044473A | Tilt detector and system | Expired / Lapsed | 1975-05-02 | 1977-08-30 | 19 | Details |
| US4026583A | Stainless steel liner in oil well pipe | Expired / Lapsed | 1975-04-28 | 1977-05-31 | 6 | Details |
| US3989284A | Tubular connection | Expired / Lapsed | 1975-04-23 | 1976-11-02 | 32 | Details |
| US3946805A | Underwater connections at well head locations | Expired / Lapsed | 1974-04-08 | 1976-03-30 | 25 | Details |
| US3937060A | Mud gas content sampling device | Expired / Lapsed | 1974-02-06 | 1976-02-10 | 19 | Details |
| US3924251A | Input signal powered converter | Expired / Lapsed | 1974-03-25 | 1975-12-02 | 5 | Details |
| US3763933A | Retrievable safety valve | Expired / Lapsed | 1971-04-06 | 1973-10-09 | 33 | Details |
| US3750751A | Subsurface safety valve | Expired / Lapsed | 1971-04-06 | 1973-08-07 | 41 | Details |
| US3744564A | Subsurface well apparatus and method | Expired / Lapsed | 1971-04-06 | 1973-07-10 | 25 | Details |
| US3674053A | Replaceable bladder pulsation dampener | Expired / Lapsed | 1970-06-12 | 1972-07-04 | 13 | Details |
| US3339632A | Underwater connector | Expired / Lapsed | 1964-01-21 | 1967-09-05 | 2 | Details |
| US3338596A | Well head connector | Expired / Lapsed | 1963-08-30 | 1967-08-29 | 2 | Details |
| US3219118A | Submarine well head tool servicing apparatus | Expired / Lapsed | 1962-01-12 | 1965-11-23 | 2 | Details |
| US3193016A | Reverse flow tubing valve | Expired / Lapsed | 1962-04-30 | 1965-07-06 | 2 | Details |
| US3185502A | Lined and sealed tubing joint | Expired / Lapsed | 1961-12-26 | 1965-05-25 | 2 | Details |
| US3100656A | Synthetic resin seal ring in tubing joint for plastic coate… | Expired / Lapsed | 1959-05-11 | 1963-08-13 | 2 | Details |
| US3035808A | Pressure responsive valve | Expired / Lapsed | 1956-08-30 | 1962-05-22 | 0 | Details |
| US2962096A | Well head connector | Expired / Lapsed | 1957-10-22 | 1960-11-29 | 0 | Details |
| US2883146A | Retractable seal valve | Expired / Lapsed | 1957-04-29 | 1959-04-21 | 0 | Details |
| US2872940A | Electrical control and indicating system | Expired / Lapsed | 1956-10-17 | 1959-02-10 | 0 | Details |
| US2532632A | Tubing and tubing joint | Expired / Lapsed | 1948-10-04 | 1950-12-05 | 0 | Details |
| US2287205A | Packing head | Expired / Lapsed | 1939-01-27 | 1942-06-23 | 0 | Details |
| US2239942A | Well pipe joint | Expired / Lapsed | 1939-05-17 | 1941-04-29 | 0 | Details |
| US2211179A | Casing joint | Expired / Lapsed | 1938-11-12 | 1940-08-13 | 0 | Details |
| US2186999A | Oil field power plant | Expired / Lapsed | 1937-12-22 | 1940-01-16 | 0 | Details |
| US2139983A | Back pressure plug valve | Expired / Lapsed | 1936-08-24 | 1938-12-13 | 0 | Details |
| US2126933A | Well drilling equipment | Expired / Lapsed | 1935-08-12 | 1938-08-16 | 0 | Details |
| US2038140A | Packing head | Expired / Lapsed | 1931-07-06 | 1936-04-21 | 0 | Details |