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:
Oct. 25, 1988
Filed:
Oct. 08, 1986
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A screen-printing paste containing Cu.sub.2 O or NiO and preferably aluminum oxide or, more preferably, an aluminum compound such as aluminum acetylacetonate which forms aluminum oxide under calcination heat, is printed over an entire surface of a substrate consisting of aluminum oxide ceramic, after which it is calcined in air at from 800.degree. to 1350.degree. C. to produce an adhesion-promoting spinel layer. That layer is then metallized by plating in an electroless bath for deposition of copper or nickel, as the case may be, after which the metal layer thus deposited is reinforced galvanically. A positive photoresist layer can be applied to the electroless deposited copper or nickel layer, illuminated through an appropriate mask and developed to expose a desired pattern of the underlying electroless copper layer for galvanic reinforcement, so that after removal of the unexposed portion of the mask the unreinforced electroless layer can be removed by etching without impairment of the reinforced conducting pattern.