Patent Explorer
Browse, filter, and analyze 15 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US2755067A | Method and apparatus for insulating a drill stem in continuous exploration of a bore hole | Sperry Sun Well Surveying Co | Expired / Lapsed | 1951-01-02 | 1956-07-17 | 1971-01-02 | 0.0 yrs | 2 | |
| US2401371A | Electrical prospecting method and apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1935-05-02 | 1946-06-04 | 1955-05-02 | 0.0 yrs | 0 | |
| US2398800A | Electrical prospecting method and apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1940-07-06 | 1946-04-23 | 1960-07-06 | 0.0 yrs | 0 | |
| US2350371A | Borehole logging apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1940-07-23 | 1944-06-06 | 1960-07-23 | 0.0 yrs | 0 | |
| US2339274A | Electrical connecting means for well bore apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1939-08-10 | 1944-01-18 | 1959-08-10 | 0.0 yrs | 0 | |
| US2300709A | Electrical prospecting method | Sperry Sun Well Surveying Co | Expired / Lapsed | 1941-01-10 | 1942-11-03 | 1961-01-10 | 0.0 yrs | 0 | |
| US2271951A | Electrical prospecting method and apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1936-02-12 | 1942-02-03 | 1956-02-12 | 0.0 yrs | 0 | |
| US2246460A | Electrical prospecting apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1938-08-02 | 1941-06-17 | 1958-08-02 | 0.0 yrs | 0 | |
| US2230502A | Electrical prospecting method and apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1938-08-02 | 1941-02-04 | 1958-08-02 | 0.0 yrs | 0 | |
| US2222136A | Electrical prospecting method and apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1938-08-02 | 1940-11-19 | 1958-08-02 | 0.0 yrs | 0 | |
| US2211158A | Method for orienting cores | Sperry Sun Well Surveying Co | Expired / Lapsed | 1938-09-13 | 1940-08-13 | 1958-09-13 | 0.0 yrs | 0 | |
| US2197493A | Electrical prospecting apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1939-04-11 | 1940-04-16 | 1959-04-11 | 0.0 yrs | 0 | |
| US2167630A | Electrical prospecting method and apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1936-04-02 | 1939-08-01 | 1956-04-02 | 0.0 yrs | 0 | |
| US2149717A | Method and apparatus for calibrating magnetometers | Sperry Sun Well Surveying Co | Expired / Lapsed | 1938-03-15 | 1939-03-07 | 1958-03-15 | 0.0 yrs | 0 | |
| US1999215A | Well surveying device | Sperry Sun Well Surveying Co | Expired / Lapsed | 1929-04-30 | 1935-04-30 | 1949-04-30 | 0.0 yrs | 0 |