Respiratory filter
US6408845B1 · kind B1 · utility
Inventors
Key dates
| Filing date | May 19, 1998 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | May 19, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S137/908
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An improved respirator filter assembly includes an integral fit seal check mechanism easily controlled by the user. Upon release, the seal check mechanism permits free airflow through the filter assembly. The seal check mechanism includes an air passageway having a sealing rim and a blocking member which is selectively movable between engaged and disengaged positions relative to the sealing rim. A spring element is disposed to releasably maintain the blocking member in the disengaged position during filter assembly operation, wherein a user may actuate the blocking member against the bias of the spring element to move the blocking member into the engaged position to substantially prevent entry of air into the air passageway during seal checking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.