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. 11, 2009
Filed:
Jun. 09, 2006
Qingxia Liu, Vernon Hills, IL (US);
David R. Blackburn, Barrington, IL (US);
Michael P. Shake, Johnsburg, IL (US);
Brian Randall, Fairview, OK (US);
John W. Wilson, Fairview, OK (US);
Dennis M. Lettkeman, Watonga, OK (US);
Qingxia Liu, Vernon Hills, IL (US);
David R. Blackburn, Barrington, IL (US);
Michael P. Shake, Johnsburg, IL (US);
Brian Randall, Fairview, OK (US);
John W. Wilson, Fairview, OK (US);
Dennis M. Lettkeman, Watonga, OK (US);
United States Gypsum Company, Chicago, IL (US);
Abstract
In a method of making a gypsum slurry, a polycarboxylate dispersant, a modifier and a hydraulic material comprising stucco are selected for use in the slurry. These components are then combined with water to form a slurry, where the modifier is added to the slurry prior to formation of a slurry phase by the water, the stucco and the dispersant. The modifier has been shown to be less effective when added after the dispersant and stucco have been contacted in an aqueous slurry. In a preferred embodiment, an amount of stucco is obtained and the modifier and dispersant are selected. A predissolved solution of a dispersant and modifier is prepared in water to form a solution prior to the addition of the stucco. After mixing the solution, the stucco is added to form the slurry. Optionally, the slurry is then shaped into a product and allowed to set.