US PATENT SUBCLASS 552 / 291
.~ Cyclohexadiene having atoms double bonded directly at the 1- and 2- positions (e.g., orthoquinones, etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
291.~ Cyclohexadiene having atoms double bonded directly at the 1- and 2- positions (e.g., orthoquinones, etc.) {1}
292  DF  .~.~> Polycyclo ring system having the cyclohexadiene as one of the cyclos

DEFINITION

Classification: 552/291

(under subclass 1) Compounds under Class 532, ..., wherein atoms are double bonded directly to the 1- and 2- positions of a cyclohexadiene ring.

(1) Note. For this and indented subclasses, the cyclohexadiene ring is numbered as follows: [figure]

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