Communications: electrical – Digital comparator systems
Patent
1978-10-13
1980-11-04
Yusko, Donald J.
Communications: electrical
Digital comparator systems
340 64, 340164R, 340543, 361172, 328 61, H04Q 132, E05B 4900, B60R 2504, G08B 1308
Patent
active
042322910
ABSTRACT:
An electronic key and lock system. The key unit is plugged in the unit and electrically interconnected therewith only through the leads. Each unit is fitted with a contact strip matrix provided with slots which allow access to the points of intersection of the contact strips from the external face of the unit, the user being provided with conductor pins that can be inserted in the slots so as to set up different combinations. Each unit contains electronic circuits designed to generate (in the case of both the key and the lock) and to detect (in the case of the lock only) a signal in which at least one parameter varies as a function of the established combination, the lock incorporating an electrical power supply for the electronic circuits of both units.
REFERENCES:
patent: 3411046 (1968-11-01), Swannick
patent: 3596250 (1971-07-01), Sedley
patent: 3657658 (1972-04-01), Kubo
patent: 3717866 (1973-02-01), Ehrlich
patent: 3787714 (1974-01-01), Resnick et al.
patent: 4038637 (1977-07-01), Peters
patent: 4050063 (1977-09-01), Schull
Drucker William A.
International Detection Protection
Yusko Donald J.
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