Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2008-05-20
2008-05-20
Crepeau, Jonathan (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C420S513000, C420S514000, C075S333000, C075S334000
Reexamination Certificate
active
07374840
ABSTRACT:
This invention relates to centrifugal atomized zinc alloy powders for alkaline batteries consisting of (a) 0.005-2% by weight of indium, and 0.005-0.2% by weight of either one of Al and Bi, or (b) 0.005-2% by weight of indium, and 0.005-0.2% by weight of Bi, and 0.001-0.5% of either one or both of Al and Ca, or (c) 0.005-2% by weight of either one or both of Bi and Al, and 0-0.5% by weight of Pb, the remainder being zinc. The powder is obtained by centrifugal atomisation in a protective atmosphere, where the oxygen content is less than 4% by volume. The resistance to corrosion in the electrolyte of the battery, especially after partial discharge, is markedly better than when the same alloys are prepared by the traditional production process. The capacity of batteries containing these powders is very good.
REFERENCES:
patent: 5917113 (1999-06-01), Suzuki
patent: 6472103 (2002-10-01), Durkot et al.
patent: 58-217608 (1983-12-01), None
patent: 61-064074 (1986-04-01), None
patent: 01-052379 (1989-02-01), None
patent: WO 94/19502 (1994-09-01), None
patent: WO99/07030 (1999-02-01), None
Certified translation of JP 1-52379 (64-52379), Feb. 28, 1989.
Handbook of Batteries, McGraw-Hill, 1995 (pp. 10.5-10.6).
Gay Bruno
Strauven Yvan
Crepeau Jonathan
Jain, Esq. Mishrilal
Nirmel & Assoc.
Umicore
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