High efficiency respirator
US4827924A · kind A · utility
161Cited by
16References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Mar 2, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B23/02
- 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.