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:
May. 26, 1987
Filed:
May. 01, 1986
Leslie S Wirt, Newhall, CA (US);
Lockheed Corporation, Calabasas, CA (US);
Abstract
In the present invention an improved sound absorbing panel is provided. The panel comprises an array of wall defining means configured to provide two or more contiguous hollow cells having adjacent open ends and adjacent closed impermeable ends, the open ends defining a sound receiving end of the array, at least one impermeable three dimensional closed surface disposed in at least one of the cells, and a flow resistive permeable facing sheet covering the sound receiving end. Approximately 50 percent of the cells may be filled in a periodic arrangement. The three dimensional closed surface may be a sphere or a cylinder and may be bonded to the closed impermeable ends or to the wall defining means. A drainage notch is provided. The present invention is particularly suitable for sound attenuation in jet engines and other applications having adverse environmental conditions and requiring sound absorptive panels, baffles, duct liners, and duct splitters.