US PATENT SUBCLASS 528 / 308.3
.~.~.~.~.~ 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}
308.1  DF  .~.~.~.~ Polyethylene Terephthalate per se {2}
308.3.~.~.~.~.~ Processes of preparing {2}
308.4  DF  .~.~.~.~.~.~> In presence of hydrocarbon, steam or water
308.5  DF  .~.~.~.~.~.~> At least two claimed distinct temperature or pressure gradients

DEFINITION

Classification: 528/308.3

Processes of preparing:

(under subclass 308.1) Subject matter wherein the process of polymerization involving the stated reactants is claimed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

308.1, for products of the such processes.