US PATENT SUBCLASS 501 / 146
.~.~.~ Chemical 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}
146.~.~.~ Chemical pretreatment {2}
147  DF  .~.~.~.~> Using alkaline compound treating agent
148  DF  .~.~.~.~> Using organic substance as treating agent

DEFINITION

Classification: 501/146

Chemical pretreatment:

(under subclass 145) Subject matter in which a pretreatment of the clay includes treatment thereof with a treating agent in addition to or other than water, which agent reacts chemically with the clay.