Method of forming a high efficiency respirator
US4883547A · kind A · utility
33Cited by
21References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1989 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Mar 1, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1082
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention provides a filtration face mask which has an expanded filtration surface area and high filter efficiency. The mask includes at least two sidewall portions generally extending away from the face of the wearer and away from an annular base. A frontal portion bridges the sidewall portions and at least two supporting arche structures are disposed at the junction of the sidewall and frontal portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.