Perfect Circle Corp
Perfect CiActive Patents
0
Total Holdings
7
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2973051A | Speed control device for an automotive vehicle | Expired / Lapsed | 1957-09-30 | 1961-02-28 | 0 | Details |
| US2968707A | Control means for oil well pumps | Expired / Lapsed | 1956-11-20 | 1961-01-17 | 0 | Details |
| US2966224A | Automotive speed control device | Expired / Lapsed | 1957-03-26 | 1960-12-27 | 0 | Details |
| US2906255A | Valve stem seal | Expired / Lapsed | 1958-06-16 | 1959-09-29 | 0 | Details |
| US2859993A | Valve stem seal | Expired / Lapsed | 1956-10-10 | 1958-11-11 | 0 | Details |
| US2621416A | Cylinder bore contour gauge | Expired / Lapsed | 1947-04-16 | 1952-12-16 | 0 | Details |
| US2618182A | Knurling tool for internal cylindrical surfaces | Expired / Lapsed | 1947-09-27 | 1952-11-18 | 0 | Details |