US PATENT SUBCLASS 552 / 250
.~.~.~.~ Carbonyl, oxygen or sulfur bonded directly to he nitrogen

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

Internet Version by PATENTEC © 1999      Terms of Use


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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
208  DF  .~ Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded directly at the 9- and 10-positions (e.g., anthraquinones, etc.) {19}
238  DF  .~.~ Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {7}
249  DF  .~.~.~ Halogen bonded directly to the anthracene configured ring system {1}
250.~.~.~.~ Carbonyl, oxygen or sulfur bonded directly to he nitrogen

DEFINITION

Classification: 552/250

(under subclass 249) Compounds wherein the nitrogen has sulfur, oxygen or carbonyl bonded directly thereto.

(1) Note. This subclass contains, for example: [figure] [figure] [figure]