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. 31, 2004
Filed:
Sep. 11, 2002
Applicant:
Inventors:
Gopalakrishnan Sethuraman, Charlotte, NC (US);
Elisha Stav, Charlotte, NC (US);
Lambert J. Metz, Tonawanda, NY (US);
Assignee:
National Gypsum Properties, LLC, Charlotte, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 3/810 ; C04B 2/814 ; B32B 5/18 ; B32B 1/308 ;
U.S. Cl.
CPC ...
C04B 3/810 ; C04B 2/814 ; B32B 5/18 ; B32B 1/308 ;
Abstract
Compositions useful for the preparation of lightweight, high strength wallboards, and methods of making same are disclosed. The composition includes a slurry of calcium sulfate hemihydrate (stucco), water, starch, and a foam. The foam acts to provide large bubbles within the core slurry, thereby lightening the weight of the wallboard. The composition and method provide wallboards having lighter weights compared to standard wallboard, increased core strength, and increased paper-to-core bonding.