US PATENT SUBCLASS 540 / 221
.~.~.~.~.~.~.~ 7,7-disubstituted

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}
200  DF  .~.~ Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen {7}
203  DF  .~.~.~ Polycyclo ring system containing the hetero ring as one of the cyclos {4}
205  DF  .~.~.~.~ The ring nitrogen is shared by a six-membered ring {2}
214  DF  .~.~.~.~.~ The six-membered ring contains sulfur {1}
215  DF  .~.~.~.~.~.~ 1-thia-5-aza-bicyclo(4.2.0)octane (including unsaturated; e.g., cepham, etc.) {9}
221.~.~.~.~.~.~.~ 7,7-disubstituted

DEFINITION

Classification: 540/221

(under subclass 215) Compounds wherein both hydrogen atoms bonded to the carbon atom in the 7-position of the cepham or cephem ring system have been replaced by substituents.

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