Method of making a flat-folded personal respiratory protection device
US6722366B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2003 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Mar 25, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B23/025
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method of making a personal respiratory protection device. The method comprises: (a) forming a multi-layered structure that comprises a first cover web, a filtration layer that comprises a web that contains electrically-charged microfibers, and a second cover web; and (b) adapting the multi-layered structure into a first panel, a central panel, and a second panel such that the central panel is separated from each of the first and second panels by first and second lines of demarcation, and each of the first, second, and central panels is non-pleated. The first and second cover webs are disposed on first and second opposing sides of the filtration layer, respectively, and at least one of the cover webs comprises spunbond fibers. The resulting respiratory protection device is capable of being folded flat at the respective lines of demarcation for storage and can be opened to form a cup-shaped air chamber over the nose and mouth of the wearer when in use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.