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. 16, 1980
Filed:
Jan. 26, 1979
Applicant:
Inventor:
David D Thornburg, Los Altos, CA (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430323 ; 156637 ; 156645 ; 156656 ; 156657 ; 156662 ; 1566591 ; 430317 ; 430325 ;
Abstract
A method of forming a defined conductive pattern in a laminar film comprising a thin gold layer interposed between an insulating substrate and a ceramic overlay is disclosed. A base etchant is employed to remove the thin ceramic layer but itself will not etch or remove the gold film layer. Upon removal of the ceramic layer, the exposed gold layer may be removed without any chemical treatment or assistance. Such removal may, for example, be accomplished by fluid agitation or exposure to a fluid stream or by swabbing. A pretreatment of the film surface prior to etching enhances the adhesion of the photoresist subsequently applied to the film surface.