US PATENT SUBCLASS 156 / 43
.~.~ Pore forming in situ

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}
43.~.~ Pore forming in situ

DEFINITION

Classification: 156/43

(under subclass 39) Processes which include the step of causing the core material to become cellular in nature after association of the core material with at least one of the facing sheets.

(1) Note. The addition of activatable foaming agents, beating, or heating of gas generating materials are some examples of the means used to cause the core to become cellular.