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:
Jun. 29, 1976
Filed:
May. 23, 1974
Donald M Hatch, Huntington Beach, CA (US);
George D Lee, Monterey Park, CA (US);
Hitco, Irvine, CA (US);
Abstract
Acoustical panels are comprised of woven fabrics which have at least one face ply portion woven of warp and fill yarns comprising yarns of non-fugitive and fugitive material. The fabric is woven relatively densely to facilitate handling and use thereof in fabrication of the acoustical panel. The substantial disintegration of the fugitive strands of yarn at the completion of the fabrication process provides a selected porosity in the face portion of the woven fabric for controlled transmission of sound waves into the interior of the panel. In a preferred method of making an acoustical panel, the fabric is woven of yarns comprising a mixture of non-fugitive and fugitive material. After installation of porous acoustical elements into pockets formed in the face portion and insertion of mandrels into flutes formed within the fabric, the fabric is impregnated with resin, cured, and the mandrels removed. The formed panel is then heated to a temperature sufficient to burn out the fugitive yarns without affecting the non-fugitive yarns to provide the face portion with a desired porosity to sound waves.