US PATENT SUBCLASS 549 / 505
.~.~.~.~ Plural double bonds between ring members of the hetero ring

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
429  DF  .~.~.~ The hetero ring is five-membered {14}
505.~.~.~.~ Plural double bonds between ring members of the hetero ring {1}
506  DF  .~.~.~.~.~> Hydrocarbyl substituted

DEFINITION

Classification: 549/505

(under subclass 429) Compounds which contain plural double bonds between ring members of the hetero ring.

(1) Note. This subclass provides for furan, per se, and for processes relating to the production, purification, separation, etc., of furan.

(2) Note. The structural formula of furan is: [figure]