Respirator
US4157091A · kind A · utility
11Cited by
6References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1977 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | Sep 12, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B7/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A respirator canister provided with openings for flow of air therethrough is filled with a chemical that removes water vapor and carbon dioxide from the air and liberates oxygen into it. A breathing tube communicates with one of the canister openings, and an expandable breathing bag or equivalent has an opening communicating with the other canister opening. A spring or the like resists expansion of the bag during exhalation through the breathing tube and canister in order to maintain the air in the respirator under positive pressure to prevent toxic air from leaking into the respirator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.