Capacitive keyboard (patent 4458293)
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| 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]
Contents
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
- ↑ US patent 4458293, Walter L. Cherry, "Capacitive keyboard", issued 3 July 1984, assigned to Cherry Electrical Products Corporation
