Respiratory protective device
US5086768A · kind A · utility
75Cited by
7References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1989 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Sep 15, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B23/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The respiratory protective device minimizes dead space by locating the exhalation valve mechanism slightly spaced from, but directly in front of the mouth. The inhalation valve mechanism surrounds the streamlined flow path leading to the exhalation valve mechanism. The inhalation valve mechanism is located in a common chamber which receives filtered air from all filter assemblies. A chin support is provided which relieves any force to the gums and teeth as a result of the mouthpiece. Alternatively, a mechanism for forcing the wearer's lips closed around the mouthpiece to maintain a seal thereto is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.