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Browse, filter, and analyze 12 patents across global jurisdictions.

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Patent Number Title Assignee Status Filing Date Grant Date Expires Remaining Claims Actions
US2301748A Electrical selective signaling system Associated Telephone and Telegraph Co Expired / Lapsed 1939-12-18 1942-11-10 1959-12-18 0.0 yrs 0
US2289939A Telephone system Associated Telephone and Telegraph Co Expired / Lapsed 1939-12-18 1942-07-14 1959-12-18 0.0 yrs 0
US2282271A Electrical signaling system Associated Telephone and Telegraph Co Expired / Lapsed 1938-10-19 1942-05-05 1958-10-19 0.0 yrs 0
US2279697A Electrical signaling system Associated Telephone and Telegraph Co Expired / Lapsed 1939-02-06 1942-04-14 1959-02-06 0.0 yrs 0
US2248784A Electrical signaling system Associated Telephone and Telegraph Co Expired / Lapsed 1939-01-18 1941-07-08 1959-01-18 0.0 yrs 0
US2176720A Electrical signaling system Associated Telephone and Telegraph Co Expired / Lapsed 1935-07-05 1939-10-17 1955-07-05 0.0 yrs 0
US2137423A Automatic switch Associated Telephone and Telegraph Co Expired / Lapsed 1935-10-31 1938-11-22 1955-10-31 0.0 yrs 0
US2135794A Remote control system Associated Telephone and Telegraph Co Expired / Lapsed 1936-01-18 1938-11-08 1956-01-18 0.0 yrs 0
US1924661A Telephone system Associated Telephone and Telegraph Co Expired / Lapsed 1931-05-04 1933-08-29 1951-05-04 0.0 yrs 0
US1901156A Telephone system Associated Telephone and Telegraph Co Expired / Lapsed 1931-06-01 1933-03-14 1951-06-01 0.0 yrs 0
US1793828A Remote control system Associated Telephone and Telegraph Co Expired / Lapsed 1927-06-11 1931-02-24 1947-06-11 0.0 yrs 0
US1789811A Counting or reglstering apparatus Associated Telephone and Telegraph Co Expired / Lapsed 1924-09-29 1931-01-20 1944-09-29 0.0 yrs 0