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:
Mar. 15, 1983
Filed:
Nov. 16, 1981
Applicant:
Inventor:
Mulk R Arora, Williamstown, MA (US);
Assignee:
Sprague Electric Company, North Adams, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25F / ;
U.S. Cl.
CPC ...
20412985 ; 20412995 ;
Abstract
Aluminum capacitor foil is etched using AC current and an etchant bath comprising 0.8 to 1.5 M hydrochloric acid, 0.4 to 0.5 M aluminum chloride, 0.04 to 0.3 M nitric acid, and 0.05 to 0.2 M tartaric acid. The frequency of the alternating current is 12 to 20 Hz, and the bath temperature is 30.degree. to 40.degree. C.