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:
Apr. 27, 1976
Filed:
Feb. 25, 1975
Jean-Paul Bernard, Dammarie-les-Lys, FR;
Pierre Jules Brussieux, Alfortville, FR;
Louis Francois Jumelle, Ris-Orangis, FR;
Jean Lucien Simonin, Issy-les-Moulineaux, FR;
Abstract
A composite material with acoustic absorption properties of the 'sandwich' ype has a core of cellular structure between two skins substantially parallel one of which is cut-out by orifices while the other is devoid of orifices. The core is composed of a plurality of cells each of which extends from one skin to the other. A plurality of small plates, of material with high acoustic resistivity, are inserted into the cellular structure. Each plate has an active part contained in a plane substantially parallel to the skins, so that the active parts form, together, the equivalent of an intermediary wall of high acoustic resistivity dividing the cellular structure into two superposed layers each formed by a mass of sub-cells.