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:
Nov. 28, 1989
Filed:
Sep. 11, 1987
Applicant:
Inventors:
Anna-Maria Weiss, Wunsiedel, DE;
Klaus Smolik, Gefrees, DE;
Assignee:
Helsa-Werke Helmut Sandler GmbH & Co. KG, Gefrees, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A62B / ;
U.S. Cl.
CPC ...
12820527 ; 12820529 ; 12820612 ; 12820619 ; 12820621 ;
Abstract
A multi-layer protective breathing mask adapted to cover the mouth and the nose of a wearer thereof comprises an outer layer, an inner layer and, between the outer and inner layers, a filter element comprising a particle filter and an adsorber filter. The adsorber filter may comprise one or more layers of foam material and the layers of foam material may be of different porosities. The at least one layer of foam material adsorber particles which may preferably be of a plurality of particle sizes.