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:
Jun. 10, 2003
Filed:
Nov. 07, 2000
Junichi Miyamoto, Togane, JP;
Maruyama Mfg. Co., Inc., Tokyo, JP;
Abstract
A centrifugal blower capable of reducing noise. The centrifugal blower comprises an impeller having a hub plate and a set of blades disposed on at least one surface of the hub plate so as to surround an axis of rotation; and a casing surrounding the impeller and having a volute portion disposed at an outer peripheral portion thereof. The portion of casing facing the set of blades is formed with a plurality of through holes, whereas a sound absorbing material is attached thereto so as to cover the through holes. The noise caused by a compression wave of air occurring between the blades of impeller and the inner face of casing is efficiently absorbed by a sound absorbing material disposed adjacent the blades.