US PATENT SUBCLASS 552 / 301
.~.~ Nitrogen double bonded directly at the 1- and 4- positions

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}
293  DF  .~ Cyclohexadiene having atoms double bonded directly at the 1- and 4- positions (e.g., paraquinones, etc.) {11}
301.~.~ Nitrogen double bonded directly at the 1- and 4- positions

DEFINITION

Classification: 552/301

(under subclass 293) Compounds wherein the 1- and 4- positions of the cyclohexadiene have nitrogen double bonded directly thereto.

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