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. 20, 2012
Filed:
Aug. 05, 2011
Applicants:
Jörg Melcher, Lehre, DE;
Daniel Fingerhut, Denkte, DE;
Christian Melcher, Lehre, DE;
Inventors:
Assignee:
Deutsches Zentrum fur Luft-und Raumfahrt E.V., Cologne, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N 1/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
A sound absorber comprises an elongated gas channel, through which a flowing gas passes in operation of the sound absorber; and at least one helical fixture mounted in a longitudinal section of the gas channel. The helical fixture defines a helical gas passage through the longitudinal section of the gas channel. Further, the helical fixture defines at least one longitudinal Helmholtz resonator within the gas channel which is excited by sound waves propagating in the flowing gas passing through the at least one gas channel.