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:
Nov. 15, 1994
Filed:
Jul. 27, 1993
Robert D Edwards, Binghamton, NY (US);
Frank D Egitto, Binghamton, NY (US);
Thomas P Gall, Endwell, NY (US);
Paul S Gursky, Vestal, NY (US);
David E Houser, Apalachin, NY (US);
James S Kamperman, Endicott, NY (US);
Warren R Wrenner, Endicott, NY (US);
International Business Machines, Inc., Armonk, NY (US);
Abstract
Disclosed is a method of producing vias and through holes through a metal laminate. The laminate is a multi-layer, for example, a trilayer of a relatively hard metal between two layers of a relatively soft metal. The method includes the steps of first etching a clearance hole through the soft metal on one side of the trilayer laminate, followed by partially etching the hard metal layer. Next, drilling the remaining thickness of the hard metal, and drilling through the second layer of soft metal.