US PATENT SUBCLASS 558 / 33
.~.~.~ The chalcogen is bonded directly to a ring

Current as of: June, 1999
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558 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
20  DF  .~ Sulfate esters ( i.e., compounds having the sulfate group, -O-S(=O)(=O)O-, bonded directly to at least one carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {11}
31  DF  .~.~ Chalcogen attached indirectly to the sulfate group by acyclic nonionic bonding {3}
33.~.~.~ The chalcogen is bonded directly to a ring

DEFINITION

Classification: 558/33

(under subclass 31) Compounds wherein a ring is bonded directly to the chalcogen.

(1) Note. An example of a compound provided for herein is: [figure]