US PATENT SUBCLASS 428 / 568
.~.~.~ Nonmetal containing

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

544  DF  ALL METAL OR WITH ADJACENT METALS {31}
546  DF  .~ Having metal particles {4}
567  DF  .~.~ Continuous interengaged phases of plural metals, or oriented fiber containing {2}
568.~.~.~ Nonmetal containing

DEFINITION

Classification: 428/568

(under subclass 567) Subject matter containing one of the following, in free or combined solid form: a noble gas, a halogen, a chalcogen (oxygen, sulfur, selenium or tellurium), nitrogen, phosphorus, carbon or boron.

(2) Note. If, in the claims as a whole, the presence of a nonmetal is optional, the patent is placed in another subclass of 567+ and is not cross-referenced in this subclass.

SEE OR SEARCH CLASS

51, Abrasive Tool Making Process, Material, or Composition, for a tool making process involving the use of metallic or metal compound materials.