Access-control apparatus

Details Access-control apparatus Access-control apparatus

1987-07-23

1989-08-15

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082556, 340712, 341 23, H04Q 100, E05B 4900

Patent

active

048579149

ABSTRACT:
For use in access-control apparatus, the character-to-key assignment in a keypad for inputting an authorization or identification code is changed at specified events so as to scroll the array of assigned characters. The security offered by the device against the inputted characters being surreptitiously "read" by observation of the keys actuated is thereby enhanced but without the operating difficulties encountered with keypads in which the character-to-key assignment is changed on a purely random basis.

REFERENCES:
patent: 3751718 (1973-08-01), Hanchett, Jr.
patent: 3885408 (1975-05-01), Clark, Jr.
patent: 4333090 (1982-06-01), Hirsch
patent: 4336530 (1982-06-01), Koike et al.
patent: 4348660 (1982-09-01), Robertsen et al.
patent: 4386351 (1983-05-01), Lowdenslager
patent: 4479112 (1984-10-01), Hirsch
patent: 4502048 (1985-02-01), Rehm
patent: 4709387 (1987-11-01), Masuda
patent: 4724423 (1988-02-01), Kinoshita

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