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:
Sep. 02, 1997
Filed:
Sep. 11, 1995
William K Ansite, Glendale, CA (US);
Gentex Corporation, Rancho Cucamonga, CA (US);
Abstract
A circular valve flapper for an unidirectional gas flow system, such as a breathing system. It has a central support an edge seal adapted to bear against a valve seat to stop the flow, and retract from the valve seat to permit flow. The flapper includes four concentric annular bands, the first being continuous with the support. The first and third bands are readily deflectable, and the second and fourth bands are relatively stiff. One, and preferably both, of the first and third bands are rolling diaphragms. The readily deflectibility of the first and third bands results in a substantial axial deflection of the edge seal, and a reduction of low frequency noise.