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. 22, 1993
Filed:
Nov. 27, 1991
Applicant:
Inventors:
Assignee:
McGean-Rohco, Inc., Cleveland, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C / ; C23C / ;
U.S. Cl.
CPC ...
106-123 ; 106-126 ; 106-127 ;
Abstract
This invention relates to a method of controlling orthophosphite ion concentration in a hypophosphite-based electroless metal plating bath, comprising the steps of contacting the plating bath with a yttrium or a lanthanide series metal salt, and removing orthophosphite ions from the bath. The methods of the present invention provide effective means for controlling phosphite ion concentration in electroless metal plating baths and especially electroless nickel plating baths. The methods of the present invention provide means for increasing pH and removing orthophosphite ions from the plating bath.