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:
Jan. 17, 1995
Filed:
Mar. 20, 1992
Applicant:
Inventors:
Walter Schmidt, Zurich, CH;
Marco Martinelli, Neftenbach, CH;
Assignee:
Dyconex AG, Zurich, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430313 ; 430315 ; 430318 ; 430323 ; 430324 ; 1566591 ; 156664 ; 156666 ;
Abstract
The surface of a metal foil to be used as an intermediate layer in printed circuit boards is chemically roughened. In one embodiment, fine depressions are etched out of the metal coating. In another embodiment, protuberances are plated thereon. The use of the method permits the use of the foil in the production of multilayer printed circuit boards with coatings having different thermal expansion characteristics and improves the adhesion with the next conductor layer applied thereto to a significant extent and prevents delamination.