US PATENT SUBCLASS 552 / 204
.~.~.~.~ Carbon double bonded directly to the tetracyclo ring system (e.g., 6 methylene tetracycline, etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
200  DF  .~ Tetracyclo naphthacene configured ring system having at least one double bond between ring members and having oxygen bonded directly to a carbon of an interior ring which carbon is a member of one ring only {2}
202  DF  .~.~ At least six oxygens bonded directly to the tetracyclo ring system {1}
203  DF  .~.~.~ Nitrogen and carbonyl or cyano bonded directly to the tetracyclo ring system (e.g., tetracycline, etc.) {3}
204.~.~.~.~ Carbon double bonded directly to the tetracyclo ring system (e.g., 6 methylene tetracycline, etc.)

DEFINITION

Classification: 552/204

(under subclass 203) Compounds which additionally have carbon double bonded directly to the tetracyclo ring system, e.g., 6-methylene tetracycline, etc.

(1) Note. This subclass contains, for example: [figure]