US PATENT SUBCLASS 549 / 257
.~.~.~.~.~.~ Of benzene or hydrocarbyl substituted benzene


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
231  DF  .~.~.~ Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring) {2}
233  DF  .~.~.~.~ The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) {7}
256  DF  .~.~.~.~.~ Preparing by oxidation {2}
257.~.~.~.~.~.~ Of benzene or hydrocarbyl substituted benzene


DEFINITION

Classification: 549/257

(under subclass 256) Processes wherein the oxidation reaction is performed on benzene or on a hydrocarbon that contains the benzene ring.

(1) Note. Examples of processes provided for herein are: oxidation of benzene to maleic anhydride and oxidation of biphenyl to phenyl maleic anhydride.