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:
Nov. 27, 2007
Filed:
May. 22, 2003
Steven A. Ferranti, Rochester, NY (US);
Dana L. Zagari, Bloomfield, NY (US);
Levern G. Burm, Jr., Waterloo, NY (US);
Karla Marie Goff, Waterloo, NY (US);
Steven A. Ferranti, Rochester, NY (US);
Dana L. Zagari, Bloomfield, NY (US);
LeVern G. Burm, Jr., Waterloo, NY (US);
Karla Marie Goff, Waterloo, NY (US);
Ferro Corporation, Cleveland, OH (US);
Abstract
The present invention provides an aqueous slurry composition that comprises cerium oxide and/or cerium oxide-containing mixed rare earth oxide abrasive particles, a polyacrylate, and an agent that retards hard settling. The agent that retards hard settling is preferably a polysaccharide such as xanthan gum, microcrystalline cellulose and/or sodium alginate, the latter of which may be treated with a divalent metal salt such as calcium carbonate. The slurry composition according to the invention can be used to polish glass and glass ceramics at a high removal rate, but does not hard settle upon extended static conditions and can be easily resuspended. The present invention also provides a method of polishing a glass or glass ceramic substrate using the slurry composition.