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:
Feb. 13, 1990
Filed:
May. 07, 1987
Applicant:
Inventors:
Naoyuki Furuta, Tokyo, JP;
Shinta Yamamura, Kanagawa, JP;
Assignee:
Nitto Boseki Co., Ltd., Fukushima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10K / ;
U.S. Cl.
CPC ...
181210 ; 181205 ; 181284 ; 181290 ; 181293 ;
Abstract
A sound absorbing pipe comprising a circumferential wall, open portions disposed at regular intervals in the circumferential wall having a predetermined area ratio and sound absorbing material disposed in a hollow formed in an interior portion of the pipe.