Key marking overlay for alphanumeric keypads

Details Key marking overlay for alphanumeric keypads Key marking overlay for alphanumeric keypads

1993-08-06

1994-10-25

Dwyer, James L.

Telephonic communications

Terminal accessory or auxiliary equipment

Attachable to terminal housing

379450, H04M 100

Patent

active

053596587

ABSTRACT:
A key marking overlay for telephone keypads. The overlay is mountable over the telephone keypad and allows pressing of the keys through the overlay. It provides a mechanism for keeping track of the keys which have been pressed during period of use of the keypad. The overlay may also present graphical indicia assigning arbitrary functions to selected keys of the keypad.

REFERENCES:
patent: 2413974 (1947-01-01), Hultgren
patent: 2889413 (1959-06-01), Steele
patent: 3073909 (1963-01-01), Tilden
patent: 3491221 (1970-01-01), Zamarra
patent: 3739105 (1973-06-01), Anson
patent: 3927282 (1975-12-01), Firstenberg
patent: 4063046 (1977-12-01), Schiffman et al.
patent: 4438300 (1984-03-01), Morse
patent: 4555600 (1985-11-01), Morse
patent: 4866764 (1989-09-01), Barker, III
patent: 5011728 (1991-04-01), Imae et al.
patent: 5140632 (1992-08-01), Anten

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