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Astech Inc

Astech Inc
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US4058678A Remote signalling to a telephone line utilizing power line … Expired / Lapsed 1976-04-07 1977-11-15 10 Details
US3949172A Telephone extension system utilizing power line carrier sig… Expired / Lapsed 1974-02-08 1976-04-06 22 Details