PHILADELPHIA STORAGE BATTERY

PHILADELPH

Active Patents

Total Holdings

Patent Holdings

Patent No.	Title	Status	Filing Date	Grant Date	Actions
US2120884A	Regulator system	Expired / Lapsed	1936-01-06	1938-06-14	Details
US1989015A	Method of making sound reproducing diaphragms	Expired / Lapsed	1932-06-10	1935-01-22	Details
US1771330A	Radio current supply device	Expired / Lapsed	1927-02-03	1930-07-22	Details