Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2007-11-06
2007-11-06
Ryan, Patrick Joseph (Department: 1745)
Metal working
Method of mechanical manufacture
Electrical device making
C429S229000, C429S233000
Reexamination Certificate
active
10976861
ABSTRACT:
A solid porous zinc electrode for use in alkaline-zinc batteries, zinc-air batteries and fuel cells is provided which comprises specific zinc filaments, fibers, threads or strands compressed into a physically-stable wooly mass to form the electrode with a controlled geometrical shape and porosity distribution. Differential densification incorporates ribs, borders, grids or tabs for good structural integrity, mechanical strength, electrochemical behavior, and electrical conductivity. Pressing in a mold or rolling of a compressed sheet can also provide an anode with a large anode/cathode interface area and a complex geometry. The filaments of controlled dimension and composition are preferably made by spin forming from molten zinc alloys. Such anodes are not susceptible to breakage, have a long storage life and can be used in high rate discharge applications.
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Compare Tekcast Spin-Casting to Other Processes, http:// www.tekcast.com/compare.htm, Tekcast Industries, Inc., pp. 1 to 3.
With Tekcast's Spin-Cast System Precision Parts Are Manufactured With Major Savings In Time & Labor . . . , http://www.tekcast.com/why.htm, Tekcast Industries, Inc., pp. 1 to 3.
Zinc Alloys, http://www.tekcast.com/casting1.htm, Tekcast Industries, Inc., pp. 1 to 3.
Oyen Wiggs Green & Mutala LLP
Parsons Thomas
Ryan Patrick Joseph
Teck Cominco Metals Ltd.
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