Respirator having thermochromic fit-indicating seal
US5617849A · kind A · utility
135Cited by
19References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Sep 12, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/042
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Respirator 10 has a respirator body 11 that is configured to fit over the nose and mouth of a wearer. A thermochromic material 18 is positioned on the respirator body 11 such that the thermochromic material 18 makes thermal contact with the wearer's face when the respirator 10 is worn. The contact causes the thermochromic material 18 to change color to allow the wearer to determine if a proper fit has been established.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.