US PATENT SUBCLASS 501 / 80
.~ Pore-forming

Current as of: June, 1999
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501 /   HD   COMPOSITIONS: CERAMIC

1  DF  CERAMIC COMPOSITIONS {15}
80.~ Pore-forming {3}
81  DF  .~.~> By use of organic combustible material {1}
84  DF  .~.~> By gas blowing, foaming agent, or in situ reactive gas generation
85  DF  .~.~> By volatilizing or heat expansion of water or other noncombustible material

DEFINITION

Classification: 501/80

Pore-forming:

(under subclass 1) Compositions other than glass compositions which are multicellular, or which are to be further treated to produce multicellular products, or processes for producing such products.

(1) Note. A positive pore-forming step is required for classifying a claim herein and porosity due to the presence of a naturally porous substance is not sufficient for inclusion herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

39, for pore-forming involving glass compositions.

SEE OR SEARCH CLASS

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

296, for porous abrading tool and process for making such. 75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

228+, for consolidated metal and ceramic powder materials, including, e.g., cermets, wherein there is a continuous metal phase and processes of making same.

106, Compositions: Coating or Plastic,

601+, for pore-forming and porous compositions comprising an alkali metal silicate; subclasses 672+ for pore-forming involving settable hydraulic cements; and subclass 122 for pore-forming involving other coating or plastic compositions.

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

10+, for foam colloid systems or agents for such systems or making or stabilizing such systems or agents, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

520, Synthetic Resins for Natural Rubbers, in particular Class 521,

50+, for porous product and pore-forming processes.