US PATENT SUBCLASS 528 / 290
.~.~.~.~ 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}
272  DF  .~.~ From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof {15}
288  DF  .~.~.~ Nitrogen-containing reactant {4}
290.~.~.~.~ Sulfur-containing reactant

DEFINITION

Classification: 528/290

(under subclass 288) Subject matter wherein a reactant contains at least one sulfur atom.

(1) Note. The sulfur and nitrogen atoms required for this subclass may be in the same reactant or may be in different reactants.