Electronic key locking circuitry

Details Electronic key locking circuitry Electronic key locking circuitry

1989-09-26

1990-07-24

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 361172, H04Q 100, H01H 4700

Patent

active

049438042

ABSTRACT:
An electronic key which responds to different sets of valid commands over its lifetime, depending on the state of certain circuits within the electronic key.

REFERENCES:
patent: 4385368 (1983-05-01), Principi et al.
patent: 4509093 (1985-04-01), Stellberger
patent: 4594637 (1986-06-01), Falk
patent: 4672379 (1989-06-01), Lewmer et al.
patent: 4870401 (1989-09-01), Lee et al.

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