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Thermally fused spacers
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Patent number 9,852,853
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Issue date Dec 26, 2017
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Hewlett-Packard Development Company, L.P.
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Luis C. Armendariz
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H01 - BASIC ELECTRIC ELEMENTS
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Keyboard
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Patent number 4,851,618
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Issue date Jul 25, 1989
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Oki Electric Industry Co., Ltd.
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Fumihiro Amino
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H01 - BASIC ELECTRIC ELEMENTS
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Switches and keyboards
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Patent number 4,839,474
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Issue date Jun 13, 1989
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Key Innovations Limited
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Richard P. Hayes-Pankhurst
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H01 - BASIC ELECTRIC ELEMENTS
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Switches and keyboards
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Patent number 4,634,818
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Issue date Jan 6, 1987
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NPM International
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Richard P. Hayes-Pankhurst
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H01 - BASIC ELECTRIC ELEMENTS
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3728509
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Patent number 3,728,509
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Issue date Apr 17, 1973
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H01 - BASIC ELECTRIC ELEMENTS