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Class Information
Number: 434/229
Name: Education and demonstration > Occupation > Keyboard operation (e.g., typing, key punching, etc.) > Means for selectively rendering key operable or inoperable
Description: Subject matter including means to lock one or more keys of a keyboard in an inoperable position and means to release a selected key so that it can be depressed.

Patents under this class:

Patent Number Title Of Patent Date Issued
6142910 Method and therapy software system for preventing computer operator injuries Nov. 7, 2000
5868647 Apparatus and method for reducing repetitive strain injuries Feb. 9, 1999
5792025 Method and apparatus for reducing repetitive motion injury risk to typist and pointer-device operators Aug. 11, 1998
5214429 Computer method utilizing keyboard adapter May. 25, 1993
5096317 Computer key cover apparatus Mar. 17, 1992
5047952 Communication system for deaf, deaf-blind, or non-vocal individuals using instrumented glove Sep. 10, 1991
4414537 Digital data entry glove interface device Nov. 8, 1983
4398086 Game-calculator having sliding mask Aug. 9, 1983
4119839 Keyboard mask for general-purpose calculator Oct. 10, 1978
4055905 Teaching typewriter Nov. 1, 1977

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