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:
Jun. 12, 2007
Filed:
Sep. 14, 1999
Honchin En, Gifu, JP;
Tohru Nakai, Gifu, JP;
Takeo Oki, Aichi, JP;
Naohiro Hirose, Gifu, JP;
Kouta Noda, Gifu, JP;
Honchin En, Gifu, JP;
Tohru Nakai, Gifu, JP;
Takeo Oki, Aichi, JP;
Naohiro Hirose, Gifu, JP;
Kouta Noda, Gifu, JP;
Ibiden Co., Ltd., Gifu, JP;
Abstract
The present invention has for its object to provide a process for manufacturing multilayer printed circuit boards which is capable of simultaneous via hole filling and formation of conductor circuit and via holes of good crystallinity and uniform deposition can be constructed on a substrate and high-density wiring and highly reliable conductor connections can be realized without annealing. The present invention is related to a process for manufacturing multilayer printed circuit boards which comprises disposing an interlayer resin insulating layer on a substrate formed with a conductor circuit, creating openings for formation of via holes in said interlayer resin insulating layer, forming an electroless plated metal layer on said interlayer resin insulating layer, disposing a resist thereon, performing electroplating, stripping the resist off and etching the electroless plated metal layer to provide a conductor circuit and via holes, wherein the electroplating is performed intermittently using said electroless plated metal layer as cathode and a plating metal as anode at a constant voltage between said anode and said cathode.