Security system

Details Security system Security system

1988-12-19

1990-11-13

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340543, 70278, H04Q 900

Patent

active

049705040

ABSTRACT:
A security system for controlling access to property having a user-operated keyboard to key in and reset a composite password code. An indicator visually displays at least one code symbol varying with time. A memory device stores a current composite password code including at least two code symbols so that upon entry of the keyed-in password code through the keyboard, one of the stored password code symbols is replaced directly by the time varying code symbol to form a regenerated, composite password code which is then compared with the keyed-in password code to grant access to the property when coincidence occurs between the keyed-in and the regenerated password codes. In response to non-coincidence, an alerting signal is generated to indicate the incorrect password condition.

REFERENCES:
patent: 4761808 (1988-08-01), Howard
patent: 4812841 (1989-03-01), Chen

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