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. 23, 2014
Filed:
Aug. 22, 2013
Applicant:
Mann+hummel Filter (Shanghai) Co. Ltd., Shanghai, CN;
Inventor:
Qiang Chen, Shanghai, CN;
Assignee:
Mann+Hummel Filter (Shanghai) Co. Ltd., Shanghai, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N 1/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A variable frequency Helmholtz resonant cavity includes a Helmholtz resonant cavity body, two Helmholtz resonant cavity pipes with different cross-sectional areas and lengths and a control valve plate. The Helmholtz resonant cavity body is connected with the main pipe of the intake system via the Helmholtz resonant cavity pipes, and the control valve plate is disposed at the location where the two Helmholtz resonant cavity pipes meet.