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. 10, 2024
Filed:
Jul. 10, 2020
Nichias Corporation, Tokyo, JP;
Tatsuro Miki, Tokyo, JP;
Kazuhiro Kikuchi, Tokyo, JP;
Tetsuya Sasakawa, Tokyo, JP;
Ikuma Fujisawa, Tokyo, JP;
NICHIAS CORPORATION, Tokyo, JP;
Abstract
A soundproof member includes: a first elastic porous body layer; a first film layer; a second elastic porous body layer; and a second film layer, the layers arranged in the stated order from a sound source (S) side, wherein the first and second elastic porous body layer each have: a thickness of 0.5 mm or more and 10 mm or less; a bulk density of 45 kg/mor more and 550 kg/mor less; and a Young's modulus of 7,000 Pa or more and 28,000 Pa or less, and wherein a total (L+L) of a ratio (L) of the thickness L(mm) of the first elastic porous body layer to a viscous characteristic length Λ(μm) thereof and a ratio (L) of the thickness L(mm) of the second elastic porous body layer () to a viscous characteristic length Λ(μm) thereof is 0.11 or more.