Advanced chemical-biological mask
US6176239A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1998 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Mar 23, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B18/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An advanced chemical-biological mask for protecting a wearer from chemical and biological environmental contaminants. The mask provides improvements for the wearer in the areas of weight/bulk, fit/comfort, optical compatibility, breathing resistance, communication, and protection. The mask includes a facepiece, eye lens, filter means, inlet and outlet valves, and a nosecup all of which may be molded or integrally bonded to the facepiece which also has a face seal adapted to engage a person's face and form seal therewith. The mask also has a suspension flange which is connected to the facepiece adjacent the seal. An elastic suspension system includes a crown portion for suspending the mask on a person's head and pulling the seal downwardly and into contact with the person's face. The separate nosecup has integral channels to direct the flow of incoming gas along a path adjacent the lens to prevent fogging of the lens. The lens is one-piece and is designed to a polynomial curvature having an optimum eye relief of about 25 millimeters. The filter means comprises low profile integral filters having immobilized carbon beds and particulate filter media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.