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. 14, 2008
Filed:
Jun. 17, 2002
Ichiro Yamagiwa, Kobe, JP;
Toshimitsu Tanaka, Kobe, JP;
Hiroki Ueda, Kobe, JP;
Hideo Utsuno, Kobe, JP;
Toru Sakatani, Kobe, JP;
Akio Sugimoto, Kobe, JP;
Ichiro Yamagiwa, Kobe, JP;
Toshimitsu Tanaka, Kobe, JP;
Hiroki Ueda, Kobe, JP;
Hideo Utsuno, Kobe, JP;
Toru Sakatani, Kobe, JP;
Akio Sugimoto, Kobe, JP;
Kabushiki Kaisha Kobe Seiko Sho, Hyogo, JP;
Abstract
A perforated soundproof structure is formed by oppositely arranging an external plateand an internal platehaving a number of through-holes. The board thickness, hole diameter and open area ratio of the internal plateare set to satisfy design conditions to give rise to a viscous effect in the air passing through the through-holes, and the design conditions are set so that the frequency bandwidth to attain an absorption coefficient of 0.3 or more is 10% or more of the resonance frequency.