Air valve for a breathing system
US4493339A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1982 |
| Grant date | Jan 15, 1985 |
| Priority date | — |
| Expiry date | May 5, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7897
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An emergency air intake valve has a circular plate having a top and bottom and depending central portion adapted to be connected to a conduit. The plate and the depending portion have a vertical bore therethrough. A diaphragm overlies the top of the plate and has a central opening aligned with the bore. The diaphragm has an enlarged depending peripheral portion adjacent the diaphragm opening and adapted to contact the top of the plate adjacent said bore. A cap secures the outer edge of the diaphragm adjacent the outer edge of the plate and forms with the diaphragm a chamber above the diaphragm. The plate has at least one opening therethrough to provide communication between the bottom of the diaphragm and the atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.