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Browse, filter, and analyze 13 patents across global jurisdictions.

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Patent Number Title Assignee Status Filing Date Grant Date Expires Remaining Claims Actions
GB1331228A Electro-optic apparatus Post Office Expired / Lapsed 1969-12-02 — 1989-12-02 0.0 yrs 0
US4445754A Glass optical fibres and glass compositions therefor Post Office Expired / Lapsed 1980-04-01 1984-05-01 2000-04-01 0.0 yrs 10
US3920900A Telecommunications receivers Post Office Expired / Lapsed 1974-08-28 1975-11-18 1994-08-28 0.0 yrs 9
US3846583A Digital communication systems Post Office Expired / Lapsed 1972-10-18 1974-11-05 1992-10-18 0.0 yrs 8
US3712536A Mean-rate indicating apparatus Post Office Expired / Lapsed 1971-03-23 1973-01-23 1991-03-23 0.0 yrs 10
US3609685A Character recognition by linear traverse Post Office Expired / Lapsed 1967-10-03 1971-09-28 1987-10-03 0.0 yrs 4
US3484559A Interstage signalling system using discrete currents or voltages Post Office Expired / Lapsed 1966-07-28 1969-12-16 1986-07-28 0.0 yrs 0
US3351858A Satellite communication systems Post Office Expired / Lapsed 1963-01-02 1967-11-07 1983-01-02 0.0 yrs 2
US2994064A Information transmitting circuits Post Office Expired / Lapsed 1955-04-11 1961-07-25 1975-04-11 0.0 yrs 0
US2960682A Decoding equipment Post Office Expired / Lapsed 1956-08-13 1960-11-15 1976-08-13 0.0 yrs 0
US2931013A Electrical selecting systems Post Office Expired / Lapsed 1954-01-18 1960-03-29 1974-01-18 0.0 yrs 0
US2927161A Pulse distribution systems Post Office Expired / Lapsed 1954-01-08 1960-03-01 1974-01-08 0.0 yrs 0
US2910541A Time-division multiplex communication systems Post Office Expired / Lapsed 1953-11-09 1959-10-27 1973-11-09 0.0 yrs 0