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:
Nov. 15, 2011
Filed:
May. 31, 2007
W. David Song, Lake Forest, IL (US);
Mark H. Englert, Libertyville, IL (US);
Qiang Yu, Grayslake, IL (US);
Martin W. Brown, Gurnee, IL (US);
Richard B. Stevens, Crystal Lake, IL (US);
W. David Song, Lake Forest, IL (US);
Mark H. Englert, Libertyville, IL (US);
Qiang Yu, Grayslake, IL (US);
Martin W. Brown, Gurnee, IL (US);
Richard B. Stevens, Crystal Lake, IL (US);
United States Gypsum Company, Chicago, IL (US);
Abstract
The acoustical product of the present invention comprises an acoustical product including a matrix of calcium sulfate dihydrate crystals and expanded perlite distributed throughout the matrix. The expanded perlite has a particle size distribution with at least 10% of the perlite having a particle diameter of 700 microns or more, and the amount of expanded perlite to calcium sulfate dihydrate is about 35% to about 75% by weight, based upon the dry weight of the calcium sulfate dihydrate. A dispersing agent and glass fibers having a particle length of about ¼ inch to about 1 inch are dispersed throughout the gypsum matrix.