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:
Apr. 01, 2014
Filed:
Jul. 10, 2009
Applicants:
Hideo Koyata, Kanagawa, JP;
Shuqiang Zhang, Singapore, SG;
Byong-wa Chun, Rancho Palos Verdes, CA (US);
Inventors:
Hideo Koyata, Kanagawa, JP;
Shuqiang Zhang, Singapore, SG;
Byong-wa Chun, Rancho Palos Verdes, CA (US);
Assignee:
W. R. Grace & Co.-Conn., Columbia, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 24/04 (2006.01); C04B 24/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to the use of polycationic compound in combination with a hydroxycarboxylic acid or salt thereof to enhance slump retention in cements and concretes having clay-bearing aggregates, wherein the clay otherwise absorbs or diminishes the dosage efficiency of polycarboxylate superplasticizers.