US PATENT SUBCLASS 549 / 512
.~.~.~ The hetero ring is three-membered consisting of one oxygen and two carbons

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}
512.~.~.~ The hetero ring is three-membered consisting of one oxygen and two carbons {7}
513  DF  .~.~.~.~> Processes {5}
543  DF  .~.~.~.~> Polycyclo ring system having the hetero ring as one of the cyclos {3}
548  DF  .~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring {1}
550  DF  .~.~.~.~> Cyano, nitrogen, or halogen bonded directly to the hetero ring
551  DF  .~.~.~.~> Nitrogen attached indirectly to the hetero ring by nonionic bonding {2}
554  DF  .~.~.~.~> Chalcogen attached indirectly to the hetero ring by nonionic bonding {2}
563  DF  .~.~.~.~> Halogen attached indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/512

(under subclass 200) Compounds which contain a three-membered ring consisting of one ring oxygen and two ring carbons: [figure]

(1) Note. This subclass does not provide for polymerized oxirane compounds, e.g., polyethylene oxide, polypropylene oxide, etc.

(2) Note. The three-membered ring provided for herein is frequently referred to as an epoxide, even though the term "epoxide" includes oxygen containing rings having more than three members.