US PATENT SUBCLASS 554 / 89
.~.~.~.~ Twitchell or Pfeilring reagent (i.e., product of sulfonation of fatty material in the presence of an aromatic hydrocarbon or phenol)

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ Fatty compounds having an acid moiety which contains the carbonyl of a carboxylic acid, salt, ester, or amide group bonded directly to one end of an acyclic chain of at least seven (7) uninterrupted carbons, wherein any additional carbonyl in the acid moiety is (1) part of an aldehyde or ketone group, (2) bonded directly to a noncarbon atom which is between the additional carbonyl and the chain, or (3) attached indirectly to the chain via ionic bonding {23}
85  DF  .~.~ Sulfur containing {4}
88  DF  .~.~.~ Sulfoxy containing (e.g., sulfones, etc.) {5}
89.~.~.~.~ Twitchell or Pfeilring reagent (i.e., product of sulfonation of fatty material in the presence of an aromatic hydrocarbon or phenol)

DEFINITION

Classification: 554/89

(under subclass 88) Compounds which are sulfo-aromatic fatty acids prepared by the action of sulfuric acid on an aromatic hydrocarbon such as naphthalene, and a fatty compound, such as castor oil or oleic acid.

(1) Note. Twitchell reagent and Pfeilring reagent are fat hydrolysis catalysts.