US PATENT SUBCLASS 501 / 150
.~.~.~ Heat pretreatment
Current as of:
June, 1999
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501 /
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COMPOSITIONS: CERAMIC
1
DF
CERAMIC COMPOSITIONS
{15}
141
DF
.~ Clay containing (e.g., porcelain, earthenware, etc.) {3}
145
DF
.~.~ Clay pretreatment {3}
150
.~.~.~ Heat pretreatment
DEFINITION
Classification: 501/150
Heat treatment:
(under subclass 145) Subject matter wherein clay is treated at an elevated temperature below that necessary to cause vitrification and in the absence of added water or ingredients which react chemically with the clay.