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BRITISH ACOUSTIC FILMS Ltd

BRITISH AC
Active Patents
0
Total Holdings
3

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2677728A Process of and apparatus for developing visible sound recor… Expired / Lapsed 1947-09-15 1954-05-04 0 Details
US2414666A Photographic sound film noise reduction system Expired / Lapsed 1931-09-17 1947-01-21 0 Details
US2324781A Arrangement for the reproduction of sound Expired / Lapsed 1942-03-19 1943-07-20 0 Details