US PATENT SUBCLASS 501 / 1
CERAMIC COMPOSITIONS

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

1CERAMIC COMPOSITIONS {15}
2  DF  .~> Devitrified glass-ceramics {4}
11  DF  .~> Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions {11}
80  DF  .~> Pore-forming {3}
86  DF  .~> Synthetic precious stones (e.g., single crystals, etc.)
87  DF  .~> Carbide or oxycarbide containing {2}
94  DF  .~> Refractory {8}
134  DF  .~> Titanate, zirconate, stannate, niobate, or tantalate or oxide of titanium, zirconium, tin, niobium, or tantalum containing (e.g., dielectrics, etc.) {1}
140  DF  .~> Elemental sulfur containing
141  DF  .~> Clay containing (e.g., porcelain, earthenware, etc.) {3}
151  DF  .~> Fluorine containing
152  DF  .~> Yttrium, lanthanide, actinide, or transactinide containing (i.e., atomic numbers 39 or 57-71 or 89+)
153  DF  .~> Aluminum compound containing
154  DF  .~> Silicon compound containing
155  DF  .~> Composed of waste material
900  DF  .~> Optical glass (e.g., silent on refractive index and/or Abbe number) {6}

DEFINITION

Classification: 501/1

CERAMIC COMPOSITIONS:

(under the class definition) Compositions other than Portland cement or cementitious material prepared from gypsum, having an inorganic base, which are heat treated to effect hardening or fusion followed by hardening when cooled either during their manufacture or during subsequent use by firing, calcining, sintering, or fusion of at least part of the inorganic material, and processes not elsewhere classified for their production.

(1) Note. Included herein are glass compositions, refractory materials employed in furnace and crucible walls, kiln-fired clay products, and similar materials.

(2) Note. Ceramic dielectrics, such as those containing barium titanate, are classified in this or indented subclasses unless they are disclosed or claimed as being piezoelectric, in which case, they are classified in Class 252, Compositions, subclass 62.9, or in Class 310, Electric Generator or Motor Structure, subclasses 8+ if claimed as having a particular shape which is particular to the piezoelectric property. If the ceramic dielectric is claimed or disclosed broadly as having piezoelectric properties, the

ceramic dielectric is not classified here either as an original or a cross reference, but is classified in appropriate class provided for the piezoelectric composition, e.g., Class 252 or Class 310 as noted above.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings), appropriate subclasses for cast monoliths or ceramic members characterized by significant structural configuration.

75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

228+, for consolidated compositions of metals or alloys including those containing ceramic or refractory or other nonmetallic components, e.g. cermets. 106, Compositions: Coating or Plastic,

739+, for the making of Portland cement; subclasses 772+ for the preparation of cementitious materials from gypsum; and subclass 313 for fluxes which are to be used in the production of ceramic compositions.

252, Compositions,

301.4+, for inorganic luminescent compositions.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes, appropriate subclass for processes, within the class definition, including a significant molding operation or a significant treatment of a molded article. In particular, see

30, 31+, 43+, 125, and 603+ therein. For a detailed discussion of the line between Class 264 and the composition classes, see the definitions of Class 264 and the notes to subclasses 56+ therein.