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. 19, 1990
Filed:
May. 23, 1988
Applicant:
Inventor:
William P Dugan, Glendora, CA (US);
Assignee:
General Dynamics Corp., Pomona Div., Pomona, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C25B / ; C25D / ;
U.S. Cl.
CPC ...
204 15 ; 204237 ; 204238 ; 204239 ; 204269 ;
Abstract
An apparatus and method are described for electroplating surfaces. The apparatus reduces the anode effect on current density, and is therefore particularly suitable for copper or nickel plating of fine-line metal circuitry. Current density regulation is achieved by separating the anode and cathode into separate cells and achieving electrolyte communication between the cells by providing a relatively high-impedance ion path. The preferred embodiment includes a siphon tube as an ion path and a pump and filter in a separate path to maintain electrolyte circulation between the cells.