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:
Jan. 12, 1999
Filed:
May. 19, 1997
Applicant:
Inventors:
Elisha Stav, M.P. Jordan Valley, IL;
Edward A Burkard, East Amherst, NY (US);
Ronald S Finkelstein, East Amherst, NY (US);
Daniel A Winkowski, Tonawanda, NY (US);
Lambert J Metz, Tonawanda, NY (US);
Patrick J Mudd, Tonawanda, NY (US);
Assignee:
National Gypsum Company, Charlotte, NC (US);
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ;
U.S. Cl.
CPC ...
106735 ; 106672 ; 106675 ; 106679 ; 106680 ; 106709 ; 106711 ; 106715 ; 106729 ; 106724 ; 106732 ; 106737 ; 106716 ; 106772 ; 106780 ; 106784 ; 106788 ; 106789 ; 106819 ; 106676 ; 106778 ;
Abstract
Cementitious binders include calcium sulfate beta-hemihydrate, a cement component comprising Portland cement, and either silica fume or rice-husk ash. The silica fume or rice-husk ash component is at least about 92 wt % amorphous silica and has an alumina content of about 0.6 wt % or less.