Unidirectional fluid valve
US4934362A · kind A · utility
70Cited by
7References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1987 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Mar 26, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7891
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The exhalation valve of a respiratory face mask, while taking up only a small area, can afford extraordinarily low pressure drop for easy breathing if constructed with a valve seat having a seal edge that defines an orifice and also forms a parabola in the plane bisecting the mask. Preferably the seal edge forms a rectangle as viewed against the direction of composite fluid flow through the valve, and a flexible flap is attached to a bridge across the center of the orifice at the apex of said parabola, each end of the flap being free to be lifted to allow fluid to flow through the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.