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PHILADELPHIA STORAGE BATTERY

PHILADELPH

Active Patents

0

Total Holdings

4

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US2120884A	Regulator system	Expired / Lapsed	1936-01-06	1938-06-14	0	Details
US1989015A	Method of making sound reproducing diaphragms	Expired / Lapsed	1932-06-10	1935-01-22	0	Details
US1869258A	Battery vent construction	Expired / Lapsed	1925-02-11	1932-07-26	0	Details
US1771330A	Radio current supply device	Expired / Lapsed	1927-02-03	1930-07-22	0	Details