US PATENT SUBCLASS 570 / 187-- .~.~.~.~ Polycyclo ring system

US PATENT SUBCLASS 570 / 187
.~.~.~.~ Polycyclo ring system

Current as of: June, 1999
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570 /	HD	ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*	DD	ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
101	DF	.~ HALOGEN CONTAINING {21}
181	DF	.~.~ Product {3}
186	DF	.~.~.~ Alicyclic ring containing {2}
187		.~.~.~.~ Polycyclo ring system

DEFINITION

Classification: 570/187

Polycyclo ring system:

(under subclass 186) Compound which contains a ring system of at least two rings which have tow or more carbon atoms in common.

(1) Note. These compounds are usually referred to in the art as fused (only two atoms in common) or bridged (three or more atoms in common).

SEE OR SEARCH CLASS

552, Organic Compounds,

653, for halogenated derivatives of Vitamin D compounds, cholecalciferols, activated 7-dehyrocholesterols, dihydrotachysterols, 3-5 cyclovitamin D compounds, etc.