US PATENT SUBCLASS 264 / 41
PORE FORMING IN SITU (E.G., FOAMING, ETC.)

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

41PORE FORMING IN SITU (E.G., FOAMING, ETC.) {6}
42  DF  .~> Of inorganic materials {1}
45.1  DF  .~> Composite article making {7}
48  DF  .~> Including surface treatment of porous body
49  DF  .~> By treating occluded solids
50  DF  .~> By mechanically introducing gas into material
51  DF  .~> By gas forming or expanding {3}

DEFINITION

Classification: 264/41

(under the class definition) Processes including the step of forming pores or voids in an article or material, said pore forming being effected internally by occluding or incorporating void forming or void producing elements or ingredients randomly throughout the plastic article forming material.

(1) Note. Where particulate material is united leaving spaces between the individual particles, the patent does not go here, but to subclass 109.

(2) Note. Processes wherein an article or material is mechanically performed to form voids are provided for in subclass 138.

(3) Note. Pore forming when not combined with significant molding is provided for in various classes and the general lines between those classes and Class 264 is followed even though the step of forming pores is recited.

(4) Note. Included within the scope of this and indented subclasses is enlarging voids already present in a material by expanding gases contained therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

317, for processes generally which involves the destruction of material which may leave a space or void. 321, for processes of reshaping previously foamed material.

610, for burning, vaporization, or melting of embedded element or core to form a nonrandom void during firing of an inorganic shaped article or preform.

SEE OR SEARCH CLASS

51, Abrasive Tool Making Process, Material, or Composition,

296, for pore forming in abrasive materials.

106, Compositions: Coating or Plastic,

122, 601+ and 672+ for pore forming, per se, in compositions within the definitions of the class.

156, Adhesive Bonding and Miscellaneous Chemical Manufacture,

77+, for a pore forming step in combination with a laminating

operation.

162, Paper Making and Fiber Liberation,

101, for a pore forming step within the class definition. 366, Agitating,

3+, for a step of gas incorporation in mixing mortar.

501, Compositions: Ceramic,

39, and 80+ for pore-forming ceramic compositions.

521, Synthetic Resins or Natural Rubbers,

50+, for pore forming, per se, in a synthetic resin or natural resin composition.

588, Hazardous or Toxic Waste Destruction or Containment,

255, for the forming of pores or voids in the production of a material containing hazardous or toxic waste for purposes of containment.