US PATENT SUBCLASS 428 / 325
.~.~ Glass or ceramic (i.e., fired or glazed clay, cement, etc.) (porcelain, quartz, etc.)

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

221  DF  WEB OR SHEET CONTAINING STRUCTURALLY DEFINED ELEMENT OR COMPONENT {9}
323  DF  .~ Including a second component containing structurally defined particles {7}
325.~.~ Glass or ceramic (i.e., fired or glazed clay, cement, etc.) (porcelain, quartz, etc.)

DEFINITION

Classification: 428/325

(under subclass 323) Product wherein the particles are of material made from clay*, usually by the agency of fire.

(1) Note. Included under this definition of ceramic* are those materials termed as glass*, pottery, enamel, cement, refractories*, porcelain* or quartz.