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:
Sep. 07, 1982
Filed:
Jul. 03, 1980
Walter Schmidt, Zurich, CH;
BBC Brown, Boveri & Company, Ltd., Baden, CH;
Abstract
An optically transparent and electrically conductive film pattern on a substrate, e.g., an electrooptical display plate provided with a patterned transparent electrode layer, is prepared by a process in which an optically transparent layer of electrically conductive material, coated on the substrate, is removed in predetermined areas by an etching treatment. In this process, the areas of the optically transparent layer on the substrate which are to be removed by etching are printed with an etchant composition which contains an etching agent for the electrically conductive material. The composition is then allowed to remain in contact with the electrically conductive material in order to etch through the areas covered by the composition. Finally, the products formed by reaction of the etchant products formed by reaction of the etchant with the conductive material are removed together with the unspent portions of the composition.