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:
Jun. 08, 2010
Filed:
Sep. 29, 2004
Yoshiki Somatomo, Kyoto, JP;
Yoshiki Somatomo, Kyoto, JP;
Hitachi Maxell, Ltd., Ibaraki-shi, Osaka, JP;
Abstract
A sealed rectangular battery having a reliably operative explosion-proof valve is provided. A rectangular battery casewhose cross-section is oblong, the battery case having a prismatic shaped case bodywith a bottom and a lid. An explosion-proof valveis arranged near one of two opposing short sides of a main surface wall of the lid. The explosion-proof valve a V-cut grooveconcavely formed in V-shaped or U-shaped in which a central bent partis positioned at a central location in the main surface wallof the lid, and a thin wallformed by the V-cut groove. Cut groovesconnecting each of two ends of the V-cut groove and each of two long sides of the main surface wall of the lid which are parallel to each other, respectively, are cut and formed in the main surface wall of the lid.