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:
Aug. 16, 2005
Filed:
May. 01, 2000
Katsuhiko Mori, Katano, JP;
Susumu Kitaoka, Hirakata, JP;
Shoji Yamashita, Hirakata, JP;
Shigekazu Tanaka, Higashiosaka, JP;
Katsuhiko Mori, Katano, JP;
Susumu Kitaoka, Hirakata, JP;
Shoji Yamashita, Hirakata, JP;
Shigekazu Tanaka, Higashiosaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Ikkoseiko Co., Ltd., Osaka, JP;
Abstract
A prismatic battery case () has a configuration wherein a rectangular shorter-side plate () has a thickness (A) larger than a thickness (B) of a longer-side plate (). When the prismatic battery case () is manufactured, a battery case material () punched into a predetermined shape undergoes deep drawing to form a first intermediate cup element () having a substantially elliptic cross section; the first intermediate cup element () undergoes redrawing successively in a plural stages to form a second intermediate cup element () having a substantially elliptic cross section which is smaller in minor-axis-diameter to major-axis-diameter ratio; and the second intermediate cup element () undergoes DI processing to form the prismatic battery case () having a substantially rectangular cross section wherein the thickness (A) of the shorter-side plate () is made larger than the thickness (B) of the longer-side plate ().