Electronic lock

Details Electronic lock Electronic lock

1973-04-25

1976-06-29

Scott, James R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307141, 307 10AT, H01H 4718

Patent

active

039671666

ABSTRACT:
An antitheft device comprising a timing circuit and preferably a rotary lock switch operated by a key will interrupt an utilization apparatus such as the ignition circuit of an automobile and sound an alarm unless the lock switch can be unlocked from a first locking position to a second locking position, and unless the lock switch can be unlocked from the second locking position to a third locking position neither earlier than a first predetermined time nor later than a second predetermined time after the lock switch is unlocked to the second locking position.

REFERENCES:
patent: 3242388 (1966-03-01), Tellerman
patent: 3576536 (1971-04-01), Wolfe
patent: 3614458 (1971-10-01), Stein
patent: 3634697 (1972-01-01), MacFarlane
patent: 3660831 (1972-05-01), Nicola et al.
patent: 3739340 (1973-06-01), Moorefield
patent: 3754164 (1973-08-01), Zorzy
patent: 3764859 (1973-10-01), Wood et al.
patent: 3772574 (1973-11-01), Hughes
patent: 3781804 (1973-12-01), Lederer, Jr.
patent: 3790933 (1974-02-01), Cort
patent: 3796889 (1974-03-01), Fradkin et al.

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