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:
Apr. 29, 2003
Filed:
Jun. 29, 1998
Douglas J. Woodnorth, Needham, MA (US);
Barbara Brys, Bedford, MA (US);
The Gillette Company, Boston, MA (US);
Abstract
The invention relates to electrochemical cells having a metal current collector, particularly zinc/MnO primary alkaline cells wherein the cathode metal current collector is the cell's steel casing. The present invention is directed to a coating on the current collector, such as the inside surface of the steel casing of an alkaline cell, to improve the cell's performance, particularly when it is used for high power applications. In accordance with the invention the current collector or inside surface of the steel casing for the cell, is preferably preplated with nickel, then plated with a layer of cobalt or cobalt alloy, and subsequently coated with a layer of carbon over the cobalt layer. The carbon may be applied from a carbon/solvent coating mixture which is dried to evaporate the solvent carrier. The service life of the cell is improved, particularly during high power applications.