Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Producing article having plural hollow channels
Reexamination Certificate
2007-12-12
2010-06-15
Griffin, Steven P (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Producing article having plural hollow channels
C264S631000
Reexamination Certificate
active
07736581
ABSTRACT:
A method is provided for manufacturing a plugged honeycomb structure30including a honeycomb substrate1and plugging portions15arranged so as to form complementary checkered patterns at both end surfaces11and21of the honeycomb substrate1. The method includes attaching a first mask film4ato the first end surface11of the honeycomb substrate1, making slurry permeation holes3ato introduce a plugging slurry6, attaching a second mask film4bto the second end surface21of the honeycomb substrate1, making slurry permeation holes3b, allowing air to flow into the cells2so as to discharge air giving a pressure of 0.05 to 5 MPa between the first mask film4aand the honeycomb substrate1; and filling cell opening end portions7with the plugging slurry6to fire the resultant slurry filled substrate20.
REFERENCES:
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patent: 2008/0164643 (2008-07-01), Ito et al.
patent: 2009/0229765 (2009-09-01), Furukubo
patent: 2009/0283928 (2009-11-01), Ito et al.
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Pending U.S. Patent Application, filed Dec. 11, 2007 in the name of Koichi Ito et al.
Ito Koichi
Tokunaga Takeshi
Griffin Steven P
Kemmerle, III Russell J
NGK Insulators Ltd.
Oliff & Berridg,e PLC
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