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. 27, 2003
Filed:
Nov. 30, 2000
Applicant:
Inventors:
Yuji Nakagawa, Tokyo, JP;
Toshihiko Nishiyama, Tokyo, JP;
Masaki Fujiwara, Tokyo, JP;
Gaku Harada, Tokyo, JP;
Shinako Kaneko, Tokyo, JP;
Masato Kurosaki, Tokyo, JP;
Assignee:
NEC Tokin Corporation, Sendai, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 4/64 ;
U.S. Cl.
CPC ...
H01M 4/64 ;
Abstract
A secondary battery comprises a pair of collectors made of a valve action metal, a pair of electrodes comprising a sulfuric acid aqueous solution, a separator and an outer can. Each collector is covered with an oxide film of a thickness of 1.7-10 nm. The oxide film is formed in a range of from 30% by area or more to less than 100% by area relative to the surface area of the collector. Each collector has one electrode disposed thereon.