Respirator
US4739755A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Oct 17, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M16/107
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The device relates to a mask worn over a wearer's face for air filtration. The mask has an inturned lip that forms a seal on the edge of the mask with the wearer's face. The mask also has at least two other contact surfaces, internal to the edge seal, which vary in length to increase the seal integrity of the mask. The mask has an exhalation valve in the front in direct line of expelled breath and a plurality of horizontal pleats below the exhalation valve such that the wearer can talk without substantial movement of the sealing edge. The mask also has two inhalation valves on each side, over the cheeks, to allow air to enter the mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.