Breathing apparatus
US4964404A · kind A · utility
55Cited by
30References
42Claims
0Family size
Inventor
Key dates
| Filing date | Apr 19, 1989 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Apr 19, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63C11/24
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A mixed gas breathing apparatus reversibly switchable between open circuit and closed circuit systems. Three embodiments show three different levels of redundancy: nonredundant, bi-linear redundant and fully redundant. The counterlung minimizes the static lung loading and thus decreases breathing resistance. Manual control system is readily accessible and allows control of addition of the breathing gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.