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:
Feb. 04, 2014
Filed:
Sep. 18, 2009
Scott A. Spoo, Deer Park, WI (US);
Dean R. Duffy, Woodbury, MN (US);
Nhat Ha Nguyen, Woodbury, MN (US);
Scott A. Spoo, Deer Park, WI (US);
Dean R. Duffy, Woodbury, MN (US);
Nhat Ha Nguyen, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A flat-fold filtering face piece respiratorthat comprises a mask bodythat has a transversely-extending line of demarcationand a longitudinal axis. First and second weld patternsare disposed above and not traversing the line of demarcation on each side of the longitudinal axis, respectively. Third and fourth weld patternsare disposed below and not crossing the line of demarcationon each side of the longitudinal axis, respectively. Each of the first, second, third, and fourth weld patterns-is a two-dimensional enclosed pattern. This combined weld patterns can provide a mask body that exhibits crush resistance without the need for additional or heavier layers, which may cause higher pressure drops across the filtering structure.