The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2004
Filed:
Sep. 19, 2002
Graham J. Bostock, Darlington, GB;
John W. Bryant, Durham, GB;
Desmond T. Curran, Durham, GB;
Christopher P. Henderson, Durham, DE;
Dennis L. Krueger, Hudson, WI (US);
James F. Dyrud, New Richmond, WI (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Fold-flat personal respiratory protection devices are provided. The devices have a flat central portion having first and second edges, a flat first member joined to the first edge through either a fold-line, seam, weld or bond that is substantially coextensive with the first edge, and a flat second member joined to the second edge through either a fold-line, seam, weld or bond that is substantially coextensive with the second edge. At least one of the central portion and first and second members are formed from filter media. The device is capable of being folded flat for storage with the first and second members being in at least partial face-to-face contact with a common surface of the central portion and, during use, is capable of forming a cup-shaped air chamber over the nose and mouth of the wearer.