US PATENT SUBCLASS 585 / 22
.~.~.~ Of differing carbon content, more than three or with bridge

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

16  DF  COMPOUND OR REACTION PRODUCT MIXTURE {3}
20  DF  .~ Alicyclic {2}
21  DF  .~.~ Polycyclo, i.e., fused {1}
22.~.~.~ Of differing carbon content, more than three or with bridge

DEFINITION

Classification: 585/22

Of differing carbon content, more than three or with bridge:

(under subclass 21) Subject matter containing at least four rings, each of which shares two adjacent carbon atoms with another ring, or two rings fused where at least one ring contains a different number of carbons from the others, or the ring system contains a bridge, that is, a carbocyclic ring which shares with another ring two carbons not adjacent to each other.

SEE OR SEARCH CLASS

552, Organic Compounds,

653, for Vitamin D compounds, cholecalciferols, dihydrotachysterols, 3-5 cyclovitamin D compounds, etc. which contain only carbon and hydrogen.