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Fides Gesellschaft fuer die Verwaltung und Verwertung von Gewerblichen Schutzrechten mbH

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2267752A Arrangement for producing filters and ultra filters Expired / Lapsed 1939-01-23 1941-12-30 0 Details
US2242042A Cold cathode for electric vacuum tubes Expired / Lapsed 1940-08-03 1941-05-13 0 Details