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:
Apr. 07, 1998
Filed:
Mar. 12, 1997
Applicant:
Inventors:
Akishi Nakaso, Oyama, JP;
Youichi Kaneko, Shimodate, JP;
Assignee:
Hitachi Chemical Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C09K / ;
U.S. Cl.
CPC ...
25218826 ; 2521881 ; 427 98 ; 427437 ; 4274431 ;
Abstract
A chemical reducing solution obtained by using an alkali boron hydride as a reductant and adding thereto a water-soluble, polyoxyethylene chain-containing organic compound having a molecular weight of 200 or above molecule as an additive has merits in that it can reduce copper oxide to metallic copper while maintaining the needle-like form of copper oxide as completely as possible and the reduction can be completed in a short period of time by a simple procedure, so that the chemical reducing solution is successfully usable in a process for producing a multi-layer printed circuit board.