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:
Sep. 08, 1987
Filed:
Apr. 21, 1986
Donald G McBride, Binghamton, NY (US);
Robert G Rickert, Endwell, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus for controlling surface chemistry on objects plated in an electroless plating bath. Cyclic voltammetry measurements are made for different pH conditions of the bath. Pourbaix diagrams are determined from these measurements which indicate the transition between metal species being plated by the bath. The open circuit potential of the bath is monitored by a potentiostat and compared with a setpoint open circuit potential which represents a desired metal species on the pourbaix diagram. The monitored open circuit potential and the setpoint are utilized to derive an error voltage. The error voltage will control the concentration of a chemical constitutent of the plating bath to maintain the desired method species on the plating surface.