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. 31, 2023
Filed:
Feb. 26, 2019
Jnc Corporation, Tokyo, JP;
Jnc Fibers Corporation, Tokyo, JP;
Takayuki Hattori, Shiga, JP;
Hidemi Ito, Shiga, JP;
JNC CORPORATION, Tokyo, JP;
JNC FIBERS CORPORATION, Tokyo, JP;
Abstract
A laminated acoustic absorption member that includes at least a first fiber layer and a second fiber layer, as well as at least one substrate layer present between the first fiber layer and the second fiber layer, wherein: the first fiber layer has an average flow pore diameter of 0.5-10 μm and a basis weight of 0.1-200 g/m; the second fiber layer has an average flow pore diameter of 0.5-10 μm, the average flow pore diameter of the second fiber layer being equal to or less than that of the first fiber layer, and also has a basis weight of 0.1-200 g/m; the substrate layer has an air permeability of 40 cc/cm·s or greater as measured by the Frazier method, and a basis weight of 1-700 g/m; and the first fiber layer and the second fiber layer are disposed on a sound-incidence side and a sound-transmission side, respectively.