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:
Jul. 18, 1978
Filed:
Apr. 15, 1976
Applicant:
Inventor:
Ernest Feder, West Hartford, CT (US);
Assignee:
United Technologies Corporation, Hartford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N / ;
U.S. Cl.
CPC ...
181213 ;
Abstract
The acoustic treatment for low frequency noise reduction is improved upon in a deep backing cavity lining configuration by providing a depending member or lip at the entrance extending into the cavity defining a space for supporting a column of air for increasing the mass reactance with a resulting decrease in the cavity depth without sacrificing sound attenuation. A slotted construction provides the smallest width of surface opening in the direction of air flow minimizing aerodynamic losses.