Electricity: circuit makers and breakers – Electric switch details – Indicators
Patent
1994-06-29
1995-04-18
Cusick, Ernest G.
Electricity: circuit makers and breakers
Electric switch details
Indicators
200310, 200311, 200312, 200DIG47, H01H 900, H01H 916
Patent
active
054080606
ABSTRACT:
An illuminated keyboard in which the keys are operable in at least two different modes. Each key is provided with symbols or areas of color which denote the different modes. The symbols or areas are selectively illuminated depending upon which mode is selected. Thus, in one mode, one area of the keys will be illuminated, while in another mode, another area of the keys will be illuminated. Thus, only the symbols or areas of color on denoting a selected mode are differentially visibly distinguishable by the user, assisting the user to press the correct key, in any selected mode.
REFERENCES:
patent: 4131777 (1978-12-01), Bailey et al.
patent: 4454501 (1985-06-01), Butts
patent: 4489310 (1984-12-01), Trostyanetsky
patent: 4987279 (1991-01-01), Hirose et al.
patent: 5012054 (1991-04-01), Rada et al.
patent: 5107082 (1992-04-01), Valenzona
patent: 5239152 (1993-08-01), Caldwell et al.
English translation of abstract for German reference DE 3235752.
Hoevel et al., IBM Technical Disclosure, vol. 26, No. 9, Feb. 1984, "Keyboard with Optically Changeable Key Symbols".
Boehm, IBM Technical Disclosure, vol. 22, No. 4, Sep. 1979, "Changeable Character Display Keyboard".
Cusick Ernest G.
Nokia Mobile Phones Ltd.
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