US PATENT SUBCLASS 523 / 153
.~.~.~.~ Containing fibrous or polycrystalline refractory oxide

Current as of: June, 1999
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523 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF {71}
149  DF  .~.~ Friction element composition or process of preparing {2}
152  DF  .~.~.~ For wheeled vehicle {4}
153.~.~.~.~ Containing fibrous or polycrystalline refractory oxide

DEFINITION

Classification: 523/153

Containing fibrous or polycrystalline refractory oxide:

(under subclass 152) Subject matter wherein the composition contains a refractory oride, either fibrous or polycrystalline in nature.

(1) Note. Single metal or double metal oxides or mixtures thereof of thoria, urania, yitria, titania, chromia, magnesia, calcia, alumina, zirconia, and of the alkaline earth or rare earth oxides are examples of refractory oxides for this subclass. Only those oxides however in fibrous or polycrystalline form are included herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

152, for placement of patents in this subclass and its indents, the classification should be based upon the specification along with the claims. Thus, the specification and the claims should be read to determine if asbestos or an organic or inorganic material is present or absent. A patent which does not claim asbestos but wherein the disclosure is limited to asbestos would be originally classified into an asbestos containing subclass.