Gas sensing drift compensation using gas self-referencing for end of service life indication for respirators
US9283411B2 · kind B2 · utility
2Cited by
18References
20Claims
0Family size
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Key dates
| Filing date | Apr 19, 2013 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Jan 9, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B18/088
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Embodiments relate generally to systems and methods for determining end of service life for a respirator cartridge by comparing the gas levels sensed at two or more sample points within the cartridge. Sample streams may run from the sample points to a gas sensor, wherein a valve may control the flow between the sample streams and the gas sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.