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. 24, 2002
Filed:
Jan. 30, 2001
Applicant:
Inventors:
Assignee:
Komatsu Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D 2/966 ;
U.S. Cl.
CPC ...
F04D 2/966 ;
Abstract
Porous damping material ( ) is attached to an entire inner circumference of the fan shroud ( ) opposing to an end of a fan ( ) and is exposed to opposing space without using conventional perforated metal. Accordingly, jet noise caused by strong swirl between the fan ( ) and the fan shroud ( ) can be damped by the damping material ( ) and impulsive sound scarcely occurs. Thus, both of the impulsive sound and the jet noise can be effectively damped, thereby securely reducing noise. The pours member ( ) constituting the porous damping material ( ) is a die-molding product made by a die ( ) having a cavity ( ).