Chemical cartridge for protective respiratory mask
US5090407A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1990 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Aug 20, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B23/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A chemical cartridge for protective respiratory mask comprising a separate active filter section and main filter section. The active filter section is formed of an absorbent medium impregnated with a reagent capable to capture and derive a target toxic pollutant having a chemically active fuction into an inert, non-volatile and non-toxic matter as air is inhaled. This active filter section is permeable to other types of pollutant. The main filter section includes activated carbon, or any other equivalent filtering material, and is positioned downstream the active filter section. In operation, the target pollutant is captured and derived into inert, non-volatile and non-toxic matter by the active filter section, while the other types of pollutants pass through this active filter section and are captured by the main filter section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.