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. 06, 1995
Filed:
Dec. 01, 1993
James E Oxley, New Haven, CT (US);
Other;
Abstract
An electrolytic apparatus and process for the on-line regeneration of acid cupric chloride etching baths used in printed circuit board fabrication is described. The apparatus utilizes a regeneration process which exactly reverses the reaction Cu+CuCl.sub.2 .fwdarw.2CuCl in order that the copper metal etched into the system is completely removed while at the same time maintaining the concentration of cuprous and cupric chloride within the desired range. A preferred system utilizes a flow-through graphite or carbon anode and a flow-by cathode, allowing for more precise control of current/potential variables. The cell utilizes low operating voltage resulting in less waste heat generation and lower electrical costs and improved on-line process control, leading to improved operating efficiencies and reliability in terms of unscheduled maintenance and outages.