Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2004-02-23
2010-02-09
Yuan, Dah-Wei D (Department: 1795)
Metal working
Method of mechanical manufacture
Electrical device making
C029S623400, C029S002000, C429S122000, C429S128000, C429S209000, C429S066000
Reexamination Certificate
active
07658774
ABSTRACT:
A method of producing a grid for a lead-acid battery in accordance with the present invention includes the step of placing lead alloy foil on a base material sheet of a lead-calcium alloy and attaching the lead alloy foil under pressure to the base material sheet. The thickness t of the lead alloy foil, the thickness a of the base material sheet before the attaching, and the thickness b of the composite sheet after the attaching satisfy the relational expression 1.3≦(a+t)/b. The length L of the contact part of rollers with the base material sheet and the lead alloy foil is 10 mm or more.This makes it possible to secure good adhesion of the lead alloy foil to the base material sheet. Also, when this composite sheet is subjected to an expanding process and used as a positive electrode grid, it is possible to provide a lead-acid battery having excellent cycle life characteristics.
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European Search Report issued in European Patent Application No. EP 04713650.0-1227 PCT/JP2004002094, dated May 7, 2008.
Itagawa Kazutoshi
Murata Yoshihiro
Yasuda Hiroshi
Yuki Masayoshi
McDermott Will & Emery LLP
Panasonic Corporation
Rademaker Claire L
Yuan Dah-Wei D
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