Coating processes – Particles – flakes – or granules coated or encapsulated
Reexamination Certificate
2007-12-18
2007-12-18
Lawrence, Frank M. (Department: 1724)
Coating processes
Particles, flakes, or granules coated or encapsulated
C427S244000, C427S350000, C427S372200, C055SDIG007
Reexamination Certificate
active
11106273
ABSTRACT:
Filter systems that are effective against a broad range of contaminants including HCN, cyanogen chloride (CK), acid contaminants. and basic contaminants such as ammonia without the need (but with the option, if desired) for using molybdenum or chromium containing materials. The filtering systems of the present invention include a tungsten-based material and other impregnants incorporated into a substrate such as filter media particles.
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Brey Larry A.
Smith Simon J.
Weagle Glenn E.
3M Innovative Properties Company
Hanson Karl G.
Kagan David B.
Lawrence Frank M.
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