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. 12, 1991
Filed:
Sep. 26, 1988
Applicant:
Inventor:
Nobuo Shigematsu, Urawa, JP;
Assignee:
Shigematsu Works Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A62B / ; A62B / ;
U.S. Cl.
CPC ...
12820712 ; 12820524 ; 12820525 ; 12820612 ;
Abstract
An exhalation valve means of a positive pressure type respiration mask which can be easily converted to a non-positive pressure type (atmospheric pressure type) mask when necessary. The exhalation valve means includes a valve body unit, which comprises an exhalation value seat, a valve body supporting member which is detachably mounted within an exhalation valve chamber, and a valve body which is supported by said valve body supporting member and energized against said exhalation valve seat. Said valve seat has a means for mounting a rubber membrane valve body which is used for the valve body unit.