US PATENT SUBCLASS 501 / 150
.~.~.~ Heat pretreatment

Current as of: June, 1999
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501 /   HD   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.