Surgical masks
US4355637A · kind A · utility
12Cited by
10References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1980 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Mar 4, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA41D13/11
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
It has already been suggested that chronic exposure of humans to nitrous oxide is a potential health hazard. There is especial concern for those working in the vicinity of a patient to whom nitrous oxide is administered as an anaesthetic. The present invention provides a disposable surgical mask characterized in that a layer comprising particles of a molecular sieve based on silicon dioxide and having an affinity for nitrous oxide is disposed between adjacent layers of the mask. Wearing such a mask reduces personal exposure to nitrous oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.