US PATENT SUBCLASS 521 / 158
.~.~.~ With ketone, aldehyde, or aldehyde derivative

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
155  DF  .~.~ Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom {10}
158.~.~.~ With ketone, aldehyde, or aldehyde derivative

DEFINITION

Classification: 521/158

With a Ketone, Aldehyde, or Aldehyde Derivative:

(under subclass 155) Subject matter wherein a ketone, aldehyde, or aldehyde derivative is reacted with a -N=C=X containing material.

(1) Note. See the Glossary of this class (521) for a definition of the term "aldehyde" or "ketone"; and see Class 528, subclass 230 for an explanation of the term aldehyde derivative.

SEE OR SEARCH THIS CLASS, SUBCLASS:

163+, for a polyarylene polyamine as a reactant which polyarylene polyamine has been prepared by the reaction of formaldehyde and an aromatic amine.