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:
Aug. 29, 2000
Filed:
May. 11, 1999
John J Hiers, Elkin, NC (US);
John K Fletcher, Winston-Salem, NC (US);
Lydall, Inc., Manchester, CT (US);
Abstract
A needled composite acoustical barrier is provided. The barrier has a non-woven first layer (13) of needleable textile first fibers (13a); the layer (13) has a thickness of between about 0.01 inch and 0.5 inch and a density of between about 1.0 and 10 lbs. per cubic foot. A non-woven, low density second layer (15) of textile second fibers (15a) is provided; the second layer (15) has a thickness of between about 0.2 inch and 5 inches and a density of between about 0.1 and 4.0 lbs. per cubic foot. A high-density intermediate acoustical barrier layer (14) is disposed between the first and second layers (13, 15); the intermediate barrier layer (14) has a thickness of between about 0.01 inch and 0.5 inch, a density of at least 50 lbs. per cubic foot, and the barrier layer has a substantially continuous film of high-density needleable polymeric material. A plurality of needled stitches (19), formed from the first fibers (13a), extend from the first layer (13), through the intermediate barrier layer (14) and at least into the second layer (15).