Cartridge respirator with service life indicator
US4326514A · kind A · utility
42Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1980 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Jun 20, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/35
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A visually observable means for indicating end of service life of hazardous vapor/gas respirator cartridges or canisters is disclosed. A colorimetric indicator in sheet form is positioned along the inner transparent sidewall of the respirator cartridge or canister.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.