US PATENT SUBCLASS 528 / 308.8
.~.~.~.~.~ Processes of preparing

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}
308  DF  .~.~.~ Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid {2}
308.6  DF  .~.~.~.~ Contains terephthalic acid or substituted forms thereof {2}
308.8.~.~.~.~.~ Processes of preparing {1}
309.1  DF  .~.~.~.~.~.~> At least two claimed distinct temperature or pressure gradients

DEFINITION

Classification: 528/308.8

Processes of preparing:

(under subclass 308.6) Subject matter wherein a polymerization process involving the stated reactants is claimed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

308.6, or 308.7, for products prepared by a process involving this subclass.