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:
Dec. 10, 2002
Filed:
Feb. 15, 2000
Andreas Weber, Mainz, DE;
Reiner Mauch, Ingelheim, DE;
Roland Buerkle, Nieder-Olm, DE;
Andreas Berndt, Oldenburg, DE;
Dirk Schlatterbeck, Mainz, DE;
Marten Walther, Engelstadt, DE;
Schott Glas, Mainz, DE;
Abstract
A method of protecting a surface of a display glass or a hard disk substrate during processing arid transport includes applying at least one polyvinyl alcohol or other polymer protective layer on the surface, which is soluble in polarorganic solvents, so that the layer can be removed after processing and transport by washing in heated water or a polar organic solvent without leaving residues on the surface. The polyvinyl alcohol used to make the protective coating has an average molecular weight of ≧ about 60,000 g/mol and a hydrolysis degree of ≧95% and the at least one polyvinyl alcohol layer is dried by heating at temperatures of about 150° C. or less to form the protective coating after applying the polyvinyl alcohol layer. The other polymers are less soluble in water than polyvinyl alcohol but are easily removed with organic solvent.