Multi-purpose telephone strain relief
US5394467A · kind A · utility
17Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1993 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Mar 26, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/03
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A one-piece, molded subassembly with a near-field acoustic chamber and a far-field acoustic chamber on either side of a centrally disposed microphone. A slightly-flared passage through the subassembly couples the far-field acoustic chamber to an exterior port in order to provide noise cancellation. A cord passage in the subassembly is directed in three mutually orthogonal directions so that a strain on the cord is not transmitted beyond the subassembly where it initially enters the handset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.