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. 13, 2004
Filed:
Dec. 21, 2001
Applicant:
Inventors:
Wolfgang Lortz, Waechtersbach, DE;
Christoph Batz-Sohn, Hanau-Mittelbuchen, DE;
Helmut Mangold, Rodenbach, DE;
Gabriele Perlet, Grosskrotzenburg, DE;
Werner Will, Gelnhausen, DE;
Assignee:
Degussa AG, Duesseldorf, DE;
Primary Examiner:
Int. Cl.
CPC ...
C09C 3/00 ; C09C 3/04 ; C09G 1/04 ;
U.S. Cl.
CPC ...
C09C 3/00 ; C09C 3/04 ; C09G 1/04 ;
Abstract
A pyrogenic process is used to prepare alkali-doped silica particles. Particles produced by this process exhibit homogeneous doping, reduced agglomeration, greater stability and higher removal rates. Aqueous dispersions containing alkali-doped pyrogenic silica with average particle size less than 100 nm are used for polishing surfaces (CMP).