US PATENT SUBCLASS 558 / 27
.~.~ Quaternary nitrogen containing

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}
27.~.~ Quaternary nitrogen containing {1}
28  DF  .~.~.~> Having -C(=X)-, wherein X is chalcogen, attached indirectly to the quaternary nitrogen

DEFINITION

Classification: 558/27

(under subclass 20) Compounds which contain a quaternary nitrogen.

(1) Note. Quaternary nitrogen is pentavalent nitrogen bonded by four valences to carbon, and ionically to an anion for the remaining valence.

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