Face mask and facepiece therefor
US4164942A · kind A · utility
52Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1977 |
| Grant date | Aug 21, 1979 |
| Priority date | — |
| Expiry date | Sep 20, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B18/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A face mask comprising a substantially planar valve block having a first aperture therethrough containing an inspiratory valve and a second aperture therethrough containing an expiratory valve. The face mask also includes a support member, and a facepiece comprising a flexible, molded member having a substantially planar face of substantially constant thickness and with two apertures therein aligned with the first and second apertures of the valve block. The substantially planar face acts as a gasket between the valve block and the support member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.