Patent Explorer
Browse, filter, and analyze 34 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US3292729A | Velocity logging apparatus | Schlumberger Well Surveying Corp | Expired / Lapsed | 1959-12-23 | 1966-12-20 | 1979-12-23 | 0.0 yrs | 2 | |
| US3275095A | Acoustic well logging apparatus | Schlumberger Well Surveying Corp | Expired / Lapsed | 1959-09-21 | 1966-09-27 | 1979-09-21 | 0.0 yrs | 2 | |
| US3257639A | Well logging system employing average travel time computation | Schlumberger Well Surveying Corp | Expired / Lapsed | 1961-11-29 | 1966-06-21 | 1981-11-29 | 0.0 yrs | 2 | |
| US3181117A | Signal processing systems | Schlumberger Well Surveying Corp | Expired / Lapsed | 1959-04-17 | 1965-04-27 | 1979-04-17 | 0.0 yrs | 2 | |
| US3090910A | System for measuring by induction the conductivity of a medium | Schlumberger Well Surveying Corp | Expired / Lapsed | 1959-05-21 | 1963-05-21 | 1979-05-21 | 0.0 yrs | 2 | |
| US3050150A | Methods for investigating earth formations | Schlumberger Well Surveying Corp | Expired / Lapsed | 1959-02-10 | 1962-08-21 | 1979-02-10 | 0.0 yrs | 0 | |
| US2994962A | Tubing measuring apparatus using pulse sequences | Schlumberger Well Surveying Corp | Expired / Lapsed | 1957-12-19 | 1961-08-08 | 1977-12-19 | 0.0 yrs | 0 | |
| US2974303A | Electrical systems for borehole apparatus | Schlumberger Well Surveying Corp | Expired / Lapsed | 1957-02-08 | 1961-03-07 | 1977-02-08 | 0.0 yrs | 0 | |
| US2884590A | Electrical well logging systems | Schlumberger Well Surveying Corp | Expired / Lapsed | 1956-10-16 | 1959-04-28 | 1976-10-16 | 0.0 yrs | 0 | |
| US2842852A | Memorizing system | Schlumberger Well Surveying Corp | Expired / Lapsed | 1955-03-16 | 1958-07-15 | 1975-03-16 | 0.0 yrs | 0 | |
| US2753520A | Methods and systems for maintaining alternating current networks in a reference condition | Schlumberger Well Surveying Corp | Expired / Lapsed | 1946-03-23 | 1956-07-03 | 1966-03-23 | 0.0 yrs | 0 | |
| US2712628A | Electrical logging apparatus | Schlumberger Well Surveying Corp | Expired / Lapsed | 1951-02-19 | 1955-07-05 | 1971-02-19 | 0.0 yrs | 0 | |
| US2712627A | Electrical resistivity well logging method and apparatus | Schlumberger Well Surveying Corp | Expired / Lapsed | 1950-05-12 | 1955-07-05 | 1970-05-12 | 0.0 yrs | 0 | |
| US2625583A | Magnetic induction well-logging instrument | Schlumberger Well Surveying Corp | Expired / Lapsed | 1950-10-28 | 1953-01-13 | 1970-10-28 | 0.0 yrs | 0 | |
| US2615956A | Borehole telemetering | Schlumberger Well Surveying Corp | Expired / Lapsed | 1951-01-05 | 1952-10-28 | 1971-01-05 | 0.0 yrs | 0 | |
| US2592101A | Electrical logging | Schlumberger Well Surveying Corp | Expired / Lapsed | 1945-10-10 | 1952-04-08 | 1965-10-10 | 0.0 yrs | 0 | |
| US2550005A | Well logging method and apparatus utilizing periodically variable spontaneous potentials | Schlumberger Well Surveying Corp | Expired / Lapsed | 1948-04-22 | 1951-04-24 | 1968-04-22 | 0.0 yrs | 0 | |
| US2547876A | Apparatus for investigating a plurality of physical values in bore-holes | Schlumberger Well Surveying Corp | Expired / Lapsed | 1944-01-05 | 1951-04-03 | 1964-01-05 | 0.0 yrs | 0 | |
| US2522522A | Shielding method and apparatus for radioactive borehole logging | Schlumberger Well Surveying Corp | Expired / Lapsed | 1941-05-03 | 1950-09-19 | 1961-05-03 | 0.0 yrs | 0 | |
| US2463252A | Frequency stabilization of alternating current networks | Schlumberger Well Surveying Corp | Expired / Lapsed | 1946-03-08 | 1949-03-01 | 1966-03-08 | 0.0 yrs | 0 |
Showing 1 to 20 of 34 patents
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