Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...
Reexamination Certificate
2003-12-23
2008-10-14
Metzmaier, Daniel S (Department: 1796)
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous liquid or supercritical phase: colloid systems;...
Aqueous continuous liquid phase and discontinuous phase...
C252S182110, C423S266000, C423S267000, C423S559000, C428S404000, C029S002000, C029S623100
Reexamination Certificate
active
07435758
ABSTRACT:
Described is an additive for producing the positive active material for lead-acid storage batteries on the basis of finely divided tetrabasic lead sulfate. The additive contains a tetrabasic lead sulfate of an average particle size smaller than about 3 μm as well as finely divided silicic acid for preventing an agglomeration of the particles of the tetrabasic lead sulfate. During maturation, this additive ensures the formation of the structure of a tetrabasic lead sulfate crystal with a very narrow bandwidth of crystal sizes and a very homogeneous distribution. In a subsequent electrochemical formation to lead oxide, this leads to particularly efficient lead-acid storage batteries. Furthermore, the invention relates to a method of making the additive according to the invention as well as its advantageous use in the positive material for the maturation and drying of singled and not singled plates in the production of lead-acid storage batteries.
REFERENCES:
patent: 1595052 (1926-08-01), Acheson
patent: 7091250 (2006-08-01), Klein et al.
patent: 2003/0175203 (2003-09-01), Nitsche et al.
patent: 3 532 697 (1987-04-01), None
patent: 1235287 (2002-08-01), None
patent: 1396308 (1975-06-01), None
German Search Report, dated May 23, 2003, for corresponding application DE 102 61 049.5.
Klein Ian
Nitsche Werner
Alston & Bird LLP
Metzmaier Daniel S
Penarroya Oxide GmbH
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