Membrane keyboard and method of using same

Details Membrane keyboard and method of using same Membrane keyboard and method of using same

1991-02-21

1993-05-18

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

341 22, 341 27, 200513, 200516, 200517, 361380, G09G 302

Patent

active

052124738

ABSTRACT:
A membrane keyboard producing audible and tactile responses when individual character keys are depressed. To facilitate typing efficiency, the keyboard has membrane characters keys with different transverse heights and adjustable sensory responses.

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patent: 4933522 (1990-06-01), Celander
patent: 5119078 (1992-06-01), Grant
IBM Technical Disclosure Bulletin, "Key Matrix Using a Fluid Medium" by Cook et al. vol. 13, No. 3, dated Aug. 1970, p. 744.
IBM Technical Disclosure Bulletin, "Briefcase-Portable Text-written with 100-key Full-Size Keyboard" by Pechanek et al. vol. 27, No. 4A, dated Sep. 1984, pp. 2002-2004.
IBM Technical Disclosure Bulletin, "Folding Computer" by IBM Corp., vol. 32, No. 10B, dated Mar. 1990, pp. 266-267.

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