US PATENT SUBCLASS 156 / 41
.~.~ With water-proofing with added material

Current as of: June, 1999
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156 /   HD   ADHESIVE BONDING AND MISCELLANEOUS CHEMICAL MANUFACTURE

1  DF  METHODS {7}
39  DF  .~ Plaster board making {6}
41.~.~ With water-proofing with added material

DEFINITION

Classification: 156/41

(under subclass 39) Processes which include the step of coating a facing sheet of, the assembled body, or adding an ingredient to the core material which coating or added ingredient renders the plasterboard impervious to the passage of water.