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. 05, 2005
Filed:
Oct. 30, 2002
Joerg Kegeler, Schleusingen, DE;
Joerg Kegeler, Schleusingen, DE;
Schott Glas, Mainz, DE;
Abstract
An inhomogeneous glass ceramic material having a ceramic phase and a glass phase is polished by a method that reduces surface roughness at a preselected temperature to values less than 2 Å. The method includes polishing the surface of the glass ceramic material at a predetermined working temperature with a polishing wheel and/or a suspension and selecting the predetermined working temperature so that differing erosion of the glass phase and the ceramic phase is compensated because of the different thermal expansion coefficients when the glass ceramic material is at the preselected temperature. In the case of the glass ceramic material the working temperature generally should be below the preselected temperature in order to minimize surface roughness.