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Autophon AG

Autophon A
Active Patents
0
Total Holdings
3

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2558853A Device for inserting corrections in a sequence of recorded … Expired / Lapsed 1948-01-16 1951-07-03 0 Details
US2424069A Voice operated switch for a duplex system Expired / Lapsed 1945-07-16 1947-07-15 0 Details
US2262321A Telegraph transmitter Expired / Lapsed 1938-08-17 1941-11-11 0 Details