Electronic key with three modes of automatic self-disablement

Details Electronic key with three modes of automatic self-disablement Electronic key with three modes of automatic self-disablement

1995-06-20

1998-11-17

Holloway, III, Edwin C.

Communications: electrical

Continuously variable indicating

With meter reading

34082534, H04Q 100

Patent

active

058382569

ABSTRACT:
An integrated circuit with three independently programmable "time bomb" functions. The integrated circuit can be set to disable itself after a certain number of power-up cycles, or after a certain total duration of operation, or after a certain absolute time and date. This is particularly advantageous for authorization functions, where the manufacturer may want to enable the user to "test drive" a demonstration or rental item of hardware or software.

REFERENCES:
patent: 3938128 (1976-02-01), Pidsosny et al.
patent: 4624578 (1986-11-01), Green
patent: 4764715 (1988-08-01), Kowalewski et al.
patent: 4805722 (1989-02-01), Keating et al.
patent: 4870401 (1989-09-01), Lee et al.
patent: 4943804 (1990-07-01), Lee et al.
patent: 5010331 (1991-04-01), Dias et al.

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