Supplied air helmet having face seal with differentiated permeability
US7197774B2 · kind B2 · utility
27Cited by
35References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2004 |
| Grant date | Apr 3, 2007 |
| Priority date | — |
| Expiry date | Oct 11, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA42B3/286
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A supplied air helmet 10 comprises a visor 14 and a face seal 12 that is secured to the visor. The face seal 12 includes a sealing member 18 and a frame member 16. The sealing member 18 extends radially inward from the frame member 16 and has first and second regions of permeability 20 and 22. The second region 22 has greater permeability than the first region 20. The use of a face seal 12 that has differentiated permeability allows for a controlled flow of air through the interior of the supplied air helmet 10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.