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Capacitive keyboard (patent 3750113)
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==Referenced by== * {{ cite patent | country = US | number = 3931610 | status = patent | title = Capacitive keyswitch sensor and method | pubdate = | gdate = 6 January 1976 | fdate = 29 November 1973 | pridate = | inventor = Robert E. Marin | invent1 = Roger K. Simonson | invent2 = Roger K. Simonson | assign1 = Teletype Corporation | assign2 = | class = }} * {{ cite patent | country = US | number = 4074262 | status = patent | title = Key input circuit | pubdate = | gdate = 14 February 1978 | fdate = 27 January 1973 | pridate = | inventor = Kosei Nomiya | invent1 = Shinkichi Hotta | invent2 = Shinkichi Hotta | assign1 = Hitachi, Ltd. | assign2 = | class = }} * {{ cite patent | country = US | number = 4110748 | status = patent | title = Keyswitch with hysteresis | pubdate = | gdate = 29 August 1978 | fdate = 6 April 1976 | pridate = | inventor = Francis C. Marino | invent1 = | invent2 = | assign1 = Burroughs Corporation | assign2 = | class = }} * {{ cite patent | country = US | number = 4222038 | status = patent | title = Microcomputer keyboard input | pubdate = | gdate = 9 September 1980 | fdate = 24 February 1978 | pridate = | inventor = Richard A. Magerl | invent1 = | invent2 = | assign1 = Motorola, Inc. | assign2 = | class = }} * {{ cite patent | country = US | number = 4288786 | status = patent | title = Touch sensing keyboard construction | pubdate = | gdate = 8 September 1981 | fdate = 15 January 1979 | pridate = | inventor = Ferenc Ledniczki | invent1 = Richard J. Patak | invent2 = | assign1 = Touch Activated Switch Arrays, Inc. | assign2 = | class = }} * {{ cite patent | country = US | number = 4390866 | status = patent | title = Keyboard with electronic hysteresis | pubdate = | gdate = 28 June 1983 | fdate = 19 February 1981 | pridate = | inventor = Keith A. Engstrom | invent1 = | invent2 = | assign1 = Illinois Tool Works, Inc. | assign2 = | class = }} * {{ cite patent | country = US | number = 4405917 | status = patent | title = Matrix screening and grounding arrangement | pubdate = | gdate = 20 September 1983 | fdate = 28 April 1981 | pridate = | inventor = Thomas Y. Chai | invent1 = | invent2 = | assign1 = Honeywell, Inc. | assign2 = | class = }} * {{ cite patent | country = US | number = 4408252 | status = patent | title = Low profile keyboard switch | pubdate = | gdate = 4 October 1983 | fdate = 16 February 1982 | pridate = | inventor = Andrew Voge | invent1 = Daniel R. Sparks | invent2 = Barry W. Mullins | assign1 = Becton Dickinson and Company | assign2 = | class = }} * {{ cite patent | country = US | number = 4412209 | status = patent | title = RC Array | pubdate = | gdate = 25 October 1983 | fdate = 20 November 1981 | pridate = | inventor = Norman J. Frame | invent1 = James P. Walber | invent2 = Jan M. Janick | assign1 = W. H. Brady Co. | assign2 = | class = }} * {{ cite patent | country = US | number = 4412754 | status = patent | title = Space bar for low profile keyboards | pubdate = | gdate = 1 November 1983 | fdate = 23 September 1982 | pridate = | inventor = Daniel R. Sparks | invent1 = | invent2 = | assign1 = Becton Dickinson and Company | assign2 = | class = }} * {{ cite patent | country = US | number = 4415781 | status = patent | title = Membrane switch | pubdate = | gdate = 15 November 1983 | fdate = 20 November 1981 | pridate = | inventor = Norman J. Frame | invent1 = James P. Walber | invent2 = Jan M. Janick | assign1 = W. H. Brady Co. | assign2 = | class = }} * {{ cite patent | country = US | number = 4431882 | status = patent | title = Transparent capacitance membrane switch | pubdate = | gdate = 14 February 1984 | fdate = 12 August 1982 | pridate = | inventor = Norman J. Frame | invent1 = | invent2 = | assign1 = W. H. Brady Co. | assign2 = | class = }} * {{ cite patent | country = US | number = 4475142 | status = patent | title = Low profile keyboard switch | pubdate = | gdate = 2 October 1984 | fdate = 7 September 1983 | pridate = | inventor = Daniel R. Sparks | invent1 = | invent2 = | assign1 = Becton Dickinson and Company | assign2 = | class = }} * {{ cite patent | country = US | number = 4494110 | status = patent | title = Keyboard modules for use in data terminals | pubdate = | gdate = 15 January 1985 | fdate = 3 March 1982 | pridate = | inventor = Antony J. Wakeling | invent1 = Alan D. Thompson | invent2 = | assign1 = Schlumberger Electronic (U.K) Ltd. | assign2 = | class = }} * {{ cite patent | country = US | number = 4502039 | status = patent | title = Keyboard coding apparatus | pubdate = | gdate = 26 February 1985 | fdate = 30 April 1982 | pridate = | inventor = Arturo Vercesi | invent1 = Francesco Marzocca | invent2 = | assign1 = Honeywell Information Systems Italia | assign2 = | class = }} * {{ cite patent | country = US | number = 4591702 | status = patent | title = Digit manipulative data input | pubdate = | gdate = 27 May 1986 | fdate = 10 April 1981 | pridate = | inventor = Naveed Alam | invent1 = | invent2 = | assign1 = | assign2 = | class = }} * {{ cite patent | country = US | number = 4704601 | status = patent | title = Keyboard data entry system with hysteresis | pubdate = | gdate = 3 November 1987 | fdate = 27 June 1985 | pridate = | inventor = Keith A. Engstrom | invent1 = | invent2 = | assign1 = Illinois Tool Works Inc. | assign2 = | class = }} * {{ cite patent | country = US | number = 4728931 | status = patent | title = Charge redistribution capacitance detection apparatus | pubdate = | gdate = 1 March 1988 | fdate = 25 July 1986 | pridate = | inventor = William J. Linder | invent1 = James D. Reinke | invent2 = | assign1 = Honeywell Inc. | assign2 = | class = }} * {{ cite patent | country = US | number = 4728932 | status = patent | title = Detector for capacitive sensing devices | pubdate = | gdate = 1 March 1988 | fdate = 25 July 1986 | pridate = | inventor = James H. Atherton | invent1 = | invent2 = | assign1 = Honeywell Inc. | assign2 = | class = }} * {{ cite patent | country = US | number = 7564247 | status = patent | title = Operationg element with a proximity sensor and shield | pubdate = | gdate = 21 July 2009 | fdate = 22 June 2006 | pridate = | inventor = Frank Born | invent1 = Norbert Mankel | invent2 = Joerg Reinhardt | assign1 = Siemens Aktiengesellschaft | assign2 = | class = }} * {{ cite patent | country = US | number = 8040321 | status = patent | title = Touch-sensor with shared capacitive sensors | pubdate = | gdate = 18 October 2011 | fdate = 10 July 2006 | pridate = | inventor = Tao Peng | invent1 = Zheng Qin | invent2 = | assign1 = Cypress Semiconductor Corporation | assign2 = | class = }} * {{ cite patent | country = US | number = 8058937 | status = patent | title = Setting a discharge rate and a charge rate of a relaxation oscillator circuit | pubdate = | gdate = 15 November 2011 | fdate = 30 January 2007 | pridate = | inventor = Zheng Qin | invent1 = Tao Peng | invent2 = | assign1 = Cypress Semiconductor Corporation | assign2 = | class = }} * {{ cite patent | country = US | number = 8059015 | status = patent | title = Capacitance sensing matrix for keyboards | pubdate = | gdate = 15 November 2011 | fdate = 25 May 2006 | pridate = | inventor = Liu Hua | invent1 = Jiang XiaoPing | invent2 = | assign1 = Cypress Semiconductor Corporation | assign2 = | class = }} * {{ cite patent | country = US | number = | status = patent | title = Apparatus and method for reducing average scan rate to detect a conductive object on a sensing device | pubdate = | gdate = 27 March 2012 | fdate = 30 March 2006 | pridate = | inventor = Zheng Qin | invent1 = Tao Peng | invent2 = | assign1 = | assign2 = | class = }}
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