Capacitive keyboard (patent 4458293)

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Capacitive keyboard (patent 4458293)
Capacitiveboardcherry.png
Country US
Patent number 4458293
Issued on 3 July 1984
Inventor Walter L. Cherry
Assignee Cherry Electrical Products Corporation
Reference US4458293 

Capacitive keyboard is an invention by Walter L. Cherry in 1982. Its patent number 4458293 was granted on 1984. [1]

Description

Capacitive keyboard

  • Patent number: 4458293
  • Inventor: Walter L. Cherry
  • Filing date: 17 May 1982
  • Issue date: 3 July 1984

Abstract

Related patents

  • US patent 4466046, Walter L. Cherry, "Capacitive keyboard switch", issued 14 August 1984, assigned to Cherry Electrical Products Corporation 
  • US patent 4529848, Walter L. Cherry, "Switch with conical spring actuator", issued 16 July 1985, assigned to Cherry Electrical Products Corporation 

Cited patents

  • US patent 3659163, Konstantin Grigorievich Borisov, "Pushbutton variable capacitor", issued 25 April 1972 
  • US patent 3797630, Sammy Zilkha, "Keyboard for electronic circuit", issued 11 April 1978 
  • US patent 4083100, John E. Flint, "Method of manufacturing a keyboard assembly", issued 11 April 1978, assigned to Mohawk Data Sciences Corporation 
  • US patent 4209819, Ewald E. Seignemartin, "Capacitive keyswitch", issued 24 June 1980, assigned to Key Tronic Corporation 

Referenced by

  • US patent 4529848, Walter L. Cherry, "Switch with conical spring actuator", issued 16 July 1985, assigned to Cherry Electrical Products Corporation 
  • US patent 4584444, Takao Nagashima, "Keyboard switch", issued 22 April 1986, assigned to Topre Corporation 
  • US patent 4665788, Jeff Tripp, "Keyboard apparatus", issued 19 May 1987 
  • US patent 7579569, Hans-Jürgen Romanowski, "Capacitive proximity and/or touch sensitive switch", issued 25 August 2009, assigned to Bsh Bosch und Siemens Hausgeraete GmbH 
  • US patent, Hoi Jin Jeong, "Capacitive switch of electric electronic/device", issued 22 June 2010, assigned to LG Electronics Inc. 

Images

References

  1. US patent 4458293, Walter L. Cherry, "Capacitive keyboard", issued 3 July 1984, assigned to Cherry Electrical Products Corporation