← Back to Companies

Stephenson Corp

Stephenson

Active Patents

0

Total Holdings

4

Patent Holdings

Filter in Explorer →

Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US3283754A	Apparatus for administering controlled volumes of gas	Expired / Lapsed	1963-07-12	1966-11-08	2	Details
US3058460A	Method and apparatus for supplying and exhausting or exchan…	Expired / Lapsed	1957-01-08	1962-10-16	0	Details
US3057346A	Apparatus for selectively providing controlled breathing or…	Expired / Lapsed	1958-07-09	1962-10-09	0	Details
US2918073A	Demand valve	Expired / Lapsed	1953-09-23	1959-12-22	0	Details