US PATENT SUBCLASS 540 / 456
.~.~.~.~.~.~ Two of the cyclos share at least three ring members or a ring member is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)

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

Internet Version by PATENTEC © 1999      Terms of Use


540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
451  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon of the hetero ring which is adjacent to the ring nitrogen (e.g., laurolactam, etc.) {7}
454  DF  .~.~.~.~ Chalcogen in the hetero ring {1}
455  DF  .~.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {1}
456.~.~.~.~.~.~ Two of the cyclos share at least three ring members or a ring member is shared by three of the cyclos (e.g., bridged, peri-fused, etc.) {1}
457  DF  .~.~.~.~.~.~.~> A five-membered cyclo of the polycyclo ring system consists of four ring carbons and one ring oxygen (e.g., fused rifamycins, etc.) {1}

DEFINITION

Classification: 540/456

(under subclass 455) Compounds wherein (a) at least three members of one cyclo are members of an additional cyclo in the polycyclo ring system, or (b) one ring member is a member of three of the cyclos in the polycyclo ring system (e.g., bridged, peri-fused, etc.).

(1) Note. An example of a compound provided for herein is: [figure]