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:
Apr. 13, 2004
Filed:
Jan. 14, 2000
Atsushi Murakami, Hamamatsu, JP;
Shuuchirou Wada, Hamamatsu, JP;
Kazuo Nishimoto, Hamamatsu, JP;
Takahiro Niwa, Ota-ku, JP;
Hiroto Sugai, Nerima-ku, JP;
Haruko Sasaki, Yokohama, JP;
Nichias Corporation, Tokyo, JP;
Abstract
A sound absorbing structure comprising at least one porous member including a plurality of holes, and the holes are at least one kind of through holes and non-through holes. It is preferable that a plurality of porous members are stacked. It is also preferable that the holes of porous members are formed as diameter-varied holes, and an area of opening of each diameter-varied hole formed in the surface opposite to a sound source is largest and the area of opening of each the diameter-varied hole is reduced in a direction of the thickness of the porous member. Moreover, it is also preferable that the sound absorbing structure further comprises a coating film formed on at least a surface of the porous member which is opposite to a sound source wherein the holes penetrates the coating film and the porous member.