Stiffness variation device
US4243838A · kind A · utility
5Cited by
3References
17Claims
0Family size
Inventor
Key dates
| Filing date | Aug 23, 1978 |
| Grant date | Jan 6, 1981 |
| Priority date | — |
| Expiry date | Aug 23, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention relates to an electromechanical apparatus for varying stiffness and is especially useful in electrodynamic systems, such as electrodynamic loudspeakers, to improve their low frequency response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.