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:
Jul. 02, 1991
Filed:
Mar. 23, 1989
Applicant:
Inventors:
Hans-Joachim Forster, Schwetzingen, DE;
Josef Gotzig, Da-Schauernheim, DE;
Jorg Brenn, Hockenheim, DE;
Wolfgang Tucholke, Riedstadt, DE;
Assignee:
Giulini Chemie GmbH, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
106603 ; 100 3835 ; 2523132 ;
Abstract
An aqueous silicic acid sol which is freeze-stabilized and which is useful for the production of phosphate-based embedding compositions used in dental technology, the aqueous silicic acid sol including from 25 to 50 weight percent of silicon dioxide; and from 2 to 10 weight % of a compound which is one of urea or a urea derivative and which has the general formula: ##STR1## wherein X and Y are groups selected from the group consisting of an --NH.sub.2 group and an --NHR group, in which R is an alkyl radical having from 1 to 4 carbon atoms.