US PATENT SUBCLASS 562 / 33
.~.~ Petroleum sulfonic acids

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}
33.~.~ Petroleum sulfonic acids {1}
34  DF  .~.~.~> Addition salts having organic nitrogen containing cation

DEFINITION

Classification: 562/33

(under subclass 30) Compounds wherein the sulfur of the

sulfonate group is bonded directly to carbon of petroleum.

(1) Note. Petroleum is considered as a naturally occurring mixture of gaseous, liquid and/or solid hydrocarbons.

(2) Note. In the case of distillable petroleum, a fraction taken over a certain boiling point range is regarded as within the scope of this subclass, if sulfonated.

(3) Note. Specific sulfonated compounds, even if identified as having been derived from petroleum or petroleum fractions, are classified with the appropriate compound as provided for.

(4) Note. Some specific types of petroleum products which, if sulfonated, are classified herein are: rhigolene, petroleum ether, gasoline, naphtha, ligroine, benzine, kerosene, lubricating oils, paraffin oil and icthyol.