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:
May. 13, 1986
Filed:
Apr. 19, 1985
Applicant:
Inventors:
Trung H Nguyen, Williamstown, MA (US);
Clinton E Hutchins, Pownal, VT (US);
Assignee:
Sprague Electric Company, North Adams, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25F / ;
U.S. Cl.
CPC ...
20412943 ; 20412975 ;
Abstract
Aluminum capacitor foil is etched by passing it through a bath of electrolyte under the influence of pulsed direct current. The pulse duration is at least nine times as long as the interval between pulses when the current falls to zero and is preferably 3 to 27 milliseconds. The pulse current density is 2 to 10 A/in.sup.2, etching temperature is 50.degree. to 90.degree. C., and the electrolyte is an aqueous solution containing sodium chloride and sodium sulfate.