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:
May. 08, 2001
Filed:
Dec. 29, 1999
Applicant:
Inventors:
Therese A. Espinoza, Wood Dale, IL (US);
Charles J. Miller, McHenry, IL (US);
Richard B. Stevens, Crystal Lake, IL (US);
Assignee:
United States Gypsum Company, Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 2/814 ;
U.S. Cl.
CPC ...
C04B 2/814 ;
Abstract
A two part joint compound which sets by hydration of calcium sulfate hemihydrate to gypsum and is clay-free. One part includes an in-situ acidic acrylate copolymer thickener (i.e., an associative thickener) with the calcium sulfate hemihydrate, along with a non-calcium bearing phosphate set preventer. The first part contains water, but remains unset for at least 175 days. The second part includes a set initiator compound having a cation with a log K value greater than calcium ions. The second part is mixed with the first part when setting is desired.