US PATENT SUBCLASS 562 / 32
.~.~ Processes of sulfonating lignites, leonardites, coal, humic acids, bark or pitch, and the reaction products thereof

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {41}
30  DF  .~ Sulfonic acids or salts thereof (i.e., compounds containing the sulfonate group, -S(=O)(=O)-O- wherein the single bonded oxygen is bonded directly to hydrogen, or to a group IA or IIA light metal or to substituted or unsubstituted ammonium) {15}
32.~.~ Processes of sulfonating lignites, leonardites, coal, humic acids, bark or pitch, and the reaction products thereof

DEFINITION

Classification: 562/32

(under subclass 30) Processes wherein lignites, leonardites, coal, humic acids, bark or pitch is sulfonated to form a sulfonic acid or salt thereof, or the reaction products of such processes.