Electronic key locking circuitry

Details Electronic key locking circuitry Electronic key locking circuitry

1988-03-02

1989-09-26

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

340825340, 361172, H04Q 100, H01H 4700

Patent

active

048704016

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 (1987-06-01), Lewiner et al.
Preliminary Data Sheet from the 1985-1986 Data Book of Dallas Semiconductor, Inc., describing the DS1204 Electronic Key (pp. 111-121).

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