Geophysical Service Inc
GeophysicaActive Patents
0
Total Holdings
8
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2557888A | Attenuating circuit | Expired / Lapsed | 1949-03-07 | 1951-06-19 | 0 | Details |
| US2548049A | Magnetic amplifier | Expired / Lapsed | 1948-07-10 | 1951-04-10 | 0 | Details |
| US2462552A | Initial attenuator control | Expired / Lapsed | 1943-01-25 | 1949-02-22 | 0 | Details |
| US2313091A | Seismic recording | Expired / Lapsed | 1939-12-26 | 1943-03-09 | 0 | Details |
| US2265513A | Prospecting method and apparatus | Expired / Lapsed | 1939-06-10 | 1941-12-09 | 0 | Details |
| US2161256A | Apparatus for determining the hardness of subsurface format… | Expired / Lapsed | 1936-04-27 | 1939-06-06 | 0 | Details |
| US2085664A | Method and apparatus for determining porosity of rock forma… | Expired / Lapsed | 1935-08-09 | 1937-06-29 | 0 | Details |
| US1978668A | Method of determining geological structure | Expired / Lapsed | 1932-03-25 | 1934-10-30 | 0 | Details |