Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Reexamination Certificate
2005-01-04
2005-01-04
Vincent, Sean (Department: 1731)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
C264S042000, C264S043000
Reexamination Certificate
active
06838026
ABSTRACT:
A method for producing a silicon nitride filter by heat-treating in nitrogen green body of from 35 to 90 mass % of silicon nitride particles having an average particle diameter of from 1 to 30 μm, from 5 to 60 mass % of a pore-forming agent and from 0.1 to 5 mass % of metal oxide particles, provided that the total amount of the silicon nitride particle , the pore-forming agent and the metal oxide particles is at least 90 mass %, to form a porous product.
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Asahi Glass Company Limited
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Vincent Sean
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