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. 28, 2005
Filed:
Nov. 28, 2001
Tsutomu Oishi, Tokyo, JP;
Yoshiya Nakamura, Tokyo, JP;
Yoshizumi Tanaka, Ube, JP;
Mitsuhiko Sato, Ube, JP;
Tsutomu Oishi, Tokyo, JP;
Yoshiya Nakamura, Tokyo, JP;
Yoshizumi Tanaka, Ube, JP;
Mitsuhiko Sato, Ube, JP;
Ishikawajima-Harima Heavy Industries Co., Ltd, Tokyo, JP;
Ube Industries, Ltd., Yamaguchi, JP;
Abstract
The porous sound-absorbing material manufactured is light and has excellent heat resistance to be applicable to the exhaust nozzle etc. of a jet engine, can effectively absorb noise as that from a jet engine, over a wide range of frequencies, is free from variations in porosity, and provides stable performance characteristics. An essential feature thereof is the formation of a skeleton of the material, with aggregates containing voids. Thus, a porous sound-absorbing material having a skeleton of aggregates with first voids is described, wherein diameters of first voids of the aggregates are 50 μm to 100 μm, approximately, and diameters of second voids between the aggregates are 100 μm to 600 μm.