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Hygrade Sylvania Corp

Hygrade Sy
Active Patents
0
Total Holdings
3

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2211614A Cathode ray tube and the like Expired / Lapsed 1937-06-24 1940-08-13 0 Details
US2211613A Cathode ray tube Expired / Lapsed 1936-08-14 1940-08-13 0 Details
US2209929A Electrographic system and apparatus Expired / Lapsed 1937-11-20 1940-07-30 0 Details