US PATENT SUBCLASS 552 / 237
.~.~.~ Oxygen, nitrogen or additional carbon bonded directly to the nitrogen

Current as of: June, 1999
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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}
236  DF  .~.~ Nitrogen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position) {1}
237.~.~.~ Oxygen, nitrogen or additional carbon bonded directly to the nitrogen

DEFINITION

Classification: 552/237

(under subclass 236) Compounds wherein the nitrogen has an additional carbon, an additional nitrogen or oxygen bonded directly thereto.

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