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:
Nov. 28, 1995
Filed:
Aug. 30, 1993
Applicant:
Inventors:
John T Kelsall, Oakville, CA;
Theodorus A Gerritsen, Burlington, CA;
Assignee:
Hatch Associates Ltd., Mississauga, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E04F / ;
U.S. Cl.
CPC ...
181224 ; 181296 ;
Abstract
In order to abate unwanted noise having as its source a stack or duct of large cross-sectional dimension, a venturi is installed in the duct such as to suppress at least the highest order modes of sound propagation in the stack or duct. The invention is most useful with stacks or ducts having a cross-sectional dimension exceeding 50 cm.