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Touch control keyboard
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Patent number 9,997,309
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Issue date Jun 12, 2018
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Bing-Yang Yao
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H03 - BASIC ELECTRONIC CIRCUITRY
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Illuminated membrane switch
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Patent number 7,071,433
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Issue date Jul 4, 2006
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Ark-Les Corporation
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David Matthew Holscher
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H01 - BASIC ELECTRIC ELEMENTS
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Unitary key panel
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Patent number 4,644,326
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Issue date Feb 17, 1987
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Secure Keyboards Limited
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Luis Villalobos
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G07 - CHECKING-DEVICES
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Input element
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Patent number 4,558,190
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Issue date Dec 10, 1985
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Canon Kabushiki Kaisha
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Tetsuro Saito
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H01 - BASIC ELECTRIC ELEMENTS
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Planar touch panel
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Patent number 4,467,151
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Issue date Aug 21, 1984
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Control Data Corporation
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Robert J. Johnson
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H01 - BASIC ELECTRIC ELEMENTS
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Membrane-type touch panel
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Patent number 4,085,302
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Issue date Apr 18, 1978
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Control Data Corporation
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George Edward Zenk
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G06 - COMPUTING CALCULATING COUNTING
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