Microphone signal attenuating apparatus for oxygen masks
US5307793A · kind A · utility
23Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B18/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The microphone of a breathing mask such as an aircraft flight crew oxygen mask is disabled during inhalation to prevent transmission of air flow sounds. In the preferred embodiments, selected mechanisms determine when breathable gas has been delivered to the mask and in response, disable the microphone by disconnecting it during this time. In another embodiment, a cover shifts into position over the microphone to prevent or reduce reception of sounds thereby during delivery of gas to the mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.