Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1985-06-17
1987-07-07
Rubinson, Gene Z.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379102, 379188, 178 2208, 380 25, H04M 1100, H04L 900
Patent
active
046792260
ABSTRACT:
A circuit (16) is designed to prevent unauthorized access to a remote device such as a computer (10) over a communications system such as a telephone network (12). A remote computer terminal (13) is connected to the telephone network (12) through a conventional modem (14). At the remote location of computer (10), circuit (16) is connected between computer (10) and another modem (15). Circuit (16) is also connected to the telephone network (12) to receive a signal therefrom which connects modem (15) through circuit (16) to computer (10) to temporarily access the same. The connection, however, is disconnected after a predetermined time period unless circuit (16) receives a second signal from the telephone network (12) before the expiration of that predetermined time period.
REFERENCES:
patent: 3641270 (1972-02-01), Ohshima et al.
patent: 3984637 (1976-10-01), Caudill et al.
patent: 4146754 (1979-03-01), Rose
patent: 4304967 (1981-12-01), Gretczko
patent: 4310720 (1982-01-01), Check, Jr.
patent: 4430728 (1984-02-01), Beitel et al.
patent: 4471489 (1984-09-01), Konetski et al.
patent: 4484306 (1984-11-01), Kulczyckyj et al.
patent: 4493947 (1985-01-01), Loveless
patent: 4499556 (1985-02-01), Halpern
patent: 4531023 (1985-07-01), Levine
patent: 4546213 (1985-10-01), Dick
patent: 4604499 (1986-08-01), Hughes
Alltel Corporation
Connors Matthew E.
Rubinson Gene Z.
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