US PATENT SUBCLASS 156 / 39
.~ Plaster board making

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

1  DF  METHODS {7}
39.~ Plaster board making {6}
40  DF  .~.~> With bending or folding of facing sheet
41  DF  .~.~> With water-proofing with added material
42  DF  .~.~> With embedding of reinforcing material during or subsequent to core formation
43  DF  .~.~> Pore forming in situ
44  DF  .~.~> With preliminary treatment of facing sheet
45  DF  .~.~> With subsequent treatment of plaster board {1}

DEFINITION

Classification: 156/39

(under subclass 1) Processes which are directed to making bodies having at least three layers, at least one of whose intermediate layers is composed of an inorganic settable material of structural strength, and whose outermost layers are of a sheet-like material.

(1) Note. The primary function of the inorganic settable material is to give structural strength to the multi-layered body.

(2) Note. The inorganic settable material is normally referred to as the core and the outer layer as the facing sheet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

346+, for plaster board making type of apparatus.

SEE OR SEARCH CLASS

106, Compositions: Coating or Plastic, 638+, for coating compositions containing an inorganic settable material.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes, appropriate subclasses for processes within the class definition for casting a settable material onto a surface and stripping therefrom when not combined with the step of adhering facing sheets to the settable material.

333, therein pertains to processes utilizing heat or pressure indicating, mold or die shaping of inorganic hydraulic settable materials, not classifiable above.

427, Coating Processes, appropriate subclass, for processes of coating a substrate.

428, Stock Material or Miscellaneous Articles,

304.4+, for a composite stock material web or sheet including a porous or cellular layer, and the appropriate subclasses under subclasses 411+ for a nonstructural "plaster-board" plural layer product.