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:
Jan. 24, 1984
Filed:
Sep. 24, 1982
Trung H Nguyen, Williamstown, MA (US);
John J Randall, Jr, North Adams, MA (US);
Allan B McPherson, North Adams, MA (US);
Sprague Electric Company, North Adams, MA (US);
Abstract
In the AC etching of aluminum foil in a hydrochloric acid electrolyte containing at least one additive, the presence of 200 to 500 ppm sulfate permits etching thicker foil for higher voltage use than is possible without the sulfate. The additive is chosen from phosphoric, nitric, and tartaric acids or salts. The presence of the relatively small amount of sulfate yields a foil with higher capacitance and generally allows lower temperatures and frequencies to be used.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile