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:
Aug. 14, 1990
Filed:
Sep. 07, 1988
Roland Herold, Berlin, DE;
Eveline Dannenberg, Berlin, DE;
Klaus Majentny, Berlin, DE;
Hermann-Josef Middeke, Berlin, DE;
Schering Aktiengesellschaft, Berlin Bergkamen, DE;
Abstract
To achieve a high adhesive strength of a metallization on an enamel, the surface of the enamel is first roughened and simultaneously treated by ultrasound to remove loose particles. Then the layer is conditioned by a wetting agent, activated and the metal layer is deposited chemically. Particularly good results are obtained when the conditioning and activation of the surface are performed at a temperature slightly elevated above room temperature, about 40.degree. C., for about 5 minutes and the roughening is performed chemically by treating with a 2% solution of ammonium hydrogen fluoride. The enamel substrates of our invention are limited to enamels, which are glass-like or partially crystallne salts of polysilicic acid which may incorporate oxides of alkali metals, alkaline-earth metals, aluminum, lead, boron, cobalt, nickel, titanium, zinc or zirconium or inorganic additives such aas sulphites, fluorides or arsenites