Electrical sensing writing pen
US4034155A · kind A · utility
19Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1976 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Apr 19, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03545
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A writing pen capacitively detects and amplifies signals generated by a writing table that produces a varying electrostatic field near its writing surface. The pen cartridge, which senses the signal, is capacitively coupled to a concentric electrode, from which the signal which has been detected may be obtained for amplification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.