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. 27, 2012
Filed:
Feb. 23, 2009
Applicants:
Kosaku Ishida, Kanagawa, JP;
Yoshitaka Watanabe, Shiga, JP;
Kazutaka Hara, Shiga, JP;
Inventors:
Assignee:
Tokyo Roki Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N 1/04 (2006.01); F01N 1/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention aims to provide a muffling structure of a vent pipe and a muffling structure of a case, which is capable of muffling in a wide frequency range and preventing vent resistance in the air pipe or the case from deterioration. Vent holes () are formed in the peripheral wall of the vent pipe (), a cover () is so provided on the peripheral wall of the vent pipe () as to cover the vent holes (!), and a bag-like body () in which activated charcoal () is contained is disposed in the space formed by the peripheral wall of the vent pipe () and the inner wall of the cover ().