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:
Oct. 12, 2004
Filed:
Oct. 18, 1999
Kichiji Misawa, Saitama, JP;
Minoru Hasegawa, Hyogo, JP;
Other;
Abstract
An air intake noise reduction apparatus is provided which can effectively reduce air intake noise even with simple construction requiring a small number of components. Four air intake passages which each have different passage lengths are formed by connecting an upper wall and a lower wall of an air intake noise reduction duct which are flattened in a vertical direction with three partition walls Air intake noise can be reduced by making pulsating air interfere with one another which is generated in the plurality of air intake passages which each have the different passage lengths in such a manner as to have different phases shifted from one another. In addition, since the partition walls function as a reinforcement rib, the rigidity of the air intake noise reduction duct can be enhanced. Moreover, since the partition walls are formed in such a manner as to extend along an intake air flow direction, increase in intake air resistance can be suppressed to a minimum level.