Patent Explorer
Browse, filter, and analyze 3 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| 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 | |
| US2246460A | Electrical prospecting apparatus | Sperry Sun Well Surveying Co | Expired / Lapsed | 1938-08-02 | 1941-06-17 | 1958-08-02 | 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 |