US PATENT SUBCLASS 528 / 321
.~.~.~ Phosphorus- or sulfur-containing reactant

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
271  DF  .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
310  DF  .~.~ From imide- or lactam-containing compound, or from an amino-nitrogen containing carboxylic acid, or derivative of an amino-nitrogen-containing carboxylic acid {9}
321.~.~.~ Phosphorus- or sulfur-containing reactant

DEFINITION

Classification: 528/321

(under subclass 310) Subject matter wherein a reactant contains a phosphorus or sulfur atom.

(1) Note. The phosphorus or sulfur atom may be part of an imide, lactam, or amino-containing carboxylic acid or derivative, or may be part of a coreactant.