US PATENT SUBCLASS 549 / 228
.~.~.~ The hetero ring contains -O-C(=X)-O- as part of its structure, wherein X is chalcogen (e.g., cyclic carbonates, etc.)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
228.~.~.~ The hetero ring contains -O-C(=X)-O- as part of its structure, wherein X is chalcogen (e.g., cyclic carbonates, etc.) {1}
229  DF  .~.~.~.~> The hetero ring is five-membered {1}

DEFINITION

Classification: 549/228

(under subclass 200) Compounds in which the hetero ring contains as part of its structure -O-C(=X)-O-, wherein X

represents chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).

(1) Note. This subclass includes cyclic carbonates.

(2) Note. Examples of compounds provided for herein are: [figure] [figure]