US PATENT SUBCLASS 524 / 67
.~.~.~.~ Oil shale

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
*  DD  .~ 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 (Class 523, subclass 1) {17}
1  DF  .~.~ Adding a NRM to a preformed solid polymer or preformed specified intermediate condensation product, composition thereof; or process of treating or composition thereof {31}
59  DF  .~.~.~ Coal, bituminous additive, extract, or derivative thereof; or oil shale; or fatty still residue DNRM {10}
67.~.~.~.~ Oil shale

DEFINITION

Classification: 524/67

Oil shale:

(under subclass 59) Subject matter wherein the DNRM is oil shale rock.

(1) Note. Oil shale is a sedimentary rock that contains little or no oil and contains organic material derived from aquatic organisms, waxy spores, and pollen grains which are converted to oil by thermal cracking. The pyrobituminous organic material which forms oil by pyrolysis is called kerogen.

(2) Note. Included herein is oil shale which contains the organic material as well as spent oil shale rock.