Voice transmission system
US4901356A · kind A · utility
22Cited by
17References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1987 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Dec 18, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B18/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A voice transmission system for a face mask includes a microphone assembly partially received in and threadedly connected to an emitter passage through the mask to position a microphone on the inside of the mask. An amplifier assembly is threaded onto the outer end of the microphone assembly until spring loaded electrical contactors on the amplifier assembly resiliently engage circumferentially continuous contacts on the microphone assembly to complete an electrical circuit between the microphone and the amplifier assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.