US PATENT SUBCLASS 156 / 44
.~.~ With preliminary treatment of facing sheet

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}
44.~.~ With preliminary treatment of facing sheet

DEFINITION

Classification: 156/44

(under subclass 39) Processes in which at least one of the facing sheets is subjected to a mechanical and/or chemical modification prior to the association of the various layers.

(1) Note. Trimming, roughening, perforating, application of adhesive, printing, and coating are some examples of the types of treatments herein included.