Musical keyboard
US4838139A · kind A · utility
14Cited by
1References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1986 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Mar 18, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S84/07
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A musical keyboard having keys which carry metal spoilers that alter the resonance characteristics of tank circuits associated with the keys as the keys move toward and away from the inductance coils of the tank circuits. The tank circuits are connected sequentially to a frequency sensing circuit which develops indications of key positions by sensing the resonance frequency of each tank circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.