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:
Mar. 28, 2000
Filed:
Jun. 24, 1997
Seyed Abolhassan Angadjivand, Woodbury, MN (US);
Tammy M Chalmers, Cottage Grove, MN (US);
James F Dyrud, New Richmond, WI (US);
Simon A Mortimer, Darlington, GB;
Scott J Tuman, Woodbury, MN (US);
Cynthia Y Tamaki, Arden Hills, MN (US);
Graham J Bostock, Darlington, GB;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A respiratory mask 1 has a molded, cup-shaped, shape-retaining shell 10 on the concave side of which is a layer of filter material 11 and, on the concave side of the filter material, without any intermediate shape-retaining layer, a layer of nonwoven material 12. The layer of filter material 11 and the inside layer 12 are conformed into the cup-shaped configuration of the shape-retaining shell 10. The inside layer 12 is preferably a smooth BMF material offering improved comfort to the wearer.