Touchpad keyboard
US4439647A · kind A · utility
28Cited by
12References
7Claims
0Family size
Inventors
Key dates
| Filing date | Jul 14, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Jul 14, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2239/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved capacitive keyboard uses a standard printed circuit board provided in various locations with spaced conductor pairs. A conductive disc with a flat insulated lower surface is aligned above each conductor pair. All of the discs are suspended above the printed circuit board within apertures of a web of polymer foam material and held in position by a sheet of adhesive covered plastic that covers and adheres to the entire upper surface of the web and each of the discs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.