Headphone
US4409442A · kind A · utility
100Cited by
6References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1981 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Apr 30, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/1066
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
First ends of first and second band pieces with a shape of a circular arc are rotatably connected with each other such that the angle formed therebetween is prevented from exceeding a predetermined angle. End pieces are slidably mounted respectively on the other ends of the first and second band pieces along the direction of extension thereof and receivers of the headphone are mounted on the respective ends of the end pieces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.