Time-key integrated circuit

Details Time-key integrated circuit Time-key integrated circuit

1989-11-14

1991-04-23

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340325340, 365 96, H04Q 100, H01H 4700

Patent

active

050103318

ABSTRACT:
A secure electronic circuit which (in its early life) can be electronically calibrated and written to, but thereafter holds its data securely.

REFERENCES:
patent: 4594637 (1986-06-01), Falk
patent: 4672379 (1987-06-01), Lewiner et al.
patent: 4870401 (1989-09-01), Lee et al.

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