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Membrane keyboard
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Patent number 6,585,435
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Issue date Jul 1, 2003
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Jason Fang
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H01 - BASIC ELECTRIC ELEMENTS
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Keyboard switch covering pads
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Patent number 4,289,940
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Issue date Sep 15, 1981
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Shin-Etsu Polymer Company, Ltd.
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Ryoichi Sado
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H01 - BASIC ELECTRIC ELEMENTS
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3898421
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Patent number 3,898,421
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Issue date Aug 5, 1975
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H01 - BASIC ELECTRIC ELEMENTS
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3789167
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Patent number 3,789,167
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Issue date Jan 29, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3773998
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Patent number 3,773,998
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Issue date Nov 20, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3721778
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Patent number 3,721,778
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Issue date Mar 20, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3699294
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Patent number 3,699,294
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Issue date Oct 17, 1972
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H01 - BASIC ELECTRIC ELEMENTS