US PATENT SUBCLASS 552 / 298
.~.~.~.~ Chalcogen single bonded directly to the polycyclo ring system

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}
295  DF  .~.~ Polycyclo ring system having the cyclohexadiene as one of the cyclos {2}
296  DF  .~.~.~ Oxygen double bonded directly at the 1- and 4- positions {3}
298.~.~.~.~ Chalcogen single bonded directly to the polycyclo ring system

DEFINITION

Classification: 552/298

(under subclass 296) Compounds wherein the polycyclo ring system has chalcogen (i.e., oxygen, sulfur, selenium or tellurium) single bonded directly thereto.

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