Demand valves for breathing apparatus
US7111625B2 · kind B2 · utility
4Cited by
13References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 2, 2004 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Jun 8, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B9/027
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
There is described a demand valve for a breathing apparatus with a “first breath” mechanism, wherein a demand valve is held closed by resiliently latching an operating diaphragm of the valve in a position wherein the valve is closed. The diaphragm is resiliently biased towards opening the valve, and the resilient latch is arranged to exert sufficient force so as not to be overcome by the resilient bias alone, but so as to be overcome by the combination of the resilient bias and a predetermined pressure difference across the diaphragm caused by sub-ambient pressure within the facepiece of the breathing apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.