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:
May. 29, 1979
Filed:
Feb. 27, 1978
Masayasu Matsumoto, Zushi, JP;
Kazuyoshi Iida, Yokohama, JP;
Yoshikazu Kondo, Yokohama, JP;
Keiichiro Mizuno, Yokohama, JP;
Sadao Nomoto, Yokohama, JP;
Noriaki Murayama, Kawasaki, JP;
Tomonori Katayama, Yokohama, JP;
Keiichiro Tabata, Yokohama, JP;
Kenichi Onda, Tokyo, JP;
Bridgestone Tire Company Limited, Tokyo, JP;
Abstract
A noise control device which produces behind it an enlarged sound reducing region is disclosed. The device comprises a hollow structural body composed of a plurality of elongate hollow passages which are different in length and constructed such that the passage length is made the longest at a substantially center part in a vertical direction and is made gradually shorter from the center part toward upper and lower edges of the hollow structural body. The upper and lower edges allow direct propagation sound emitted from a noise source to pass thereover and therethrough.