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. 29, 1991
Filed:
Feb. 02, 1990
Applicant:
Inventor:
Delbert W Torkelson, Claremore, OK (US);
Assignee:
501 Nordam, Tulsa, OK (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N / ; F02K / ;
U.S. Cl.
CPC ...
60262 ; 60271 ; 181213 ; 415119 ;
Abstract
A noise reduction system for a jet engine including a tubular exhaust shroud affixed to the engine through which engine exhaust gases pass, porous acoustical lining affixed to a substantial portion of the internal circumferential surface of the shroud, a chamber in contact with the acoustical lining outer surface and a controllable source of air pressure affixed to the chamber to control the passage of air through the acoustical lining to thereby vary the acoustical absorption properties of the lining.