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:
Jan. 31, 1989
Filed:
Feb. 18, 1986
Yukihiko Hanzawa, Tochigi, JP;
Haruki Kawauchi, Tochigi, JP;
Tukasa Mikami, Saitama, JP;
Akinobu Takagi, Kanagawa, JP;
Yohji Kurotobi, Saitama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A silencer includes an air passage tube having an air inlet for introducing air thereinto, and a side branch tube connected to the air passage tube and having a closed end for attenuating noise produced by the air introduced into the air passage tube. The side branch tube may be either a flexible tube or have a flexible portion for allowing convenient bending and mounting thereof in the available space. The side branch tube may comprise a pair of different tube portions connected to each other. The side branch tube may have a water drain hole defined in its lowermost portion and preferably the cross-sectional area of the water drain hole is no greater than 1% of the cross-sectional area of the side branch tube. The side branch tube serves to attenuate high-frequency noise and the silencer may additionally include a resonator chamber for attenuating low-frequency noise.