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Perfect Circle Corp

Perfect Ci

Active Patents

0

Total Holdings

5

Patent Holdings

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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
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