US PATENT SUBCLASS 528 / 308.1
.~.~.~.~ Polyethylene Terephthalate per se

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.~.~.~.~ Polyethylene Terephthalate per se {2}
308.2  DF  .~.~.~.~.~> Physically after-treated solid polymer
308.3  DF  .~.~.~.~.~> Processes of preparing {2}

DEFINITION

Classification: 528/308.1

Polyethylene terephthalate, per se:

(under subclass 308) Subject matter wherein the process involves either ethylene glycol and terephthalic acid, per se; ethylene glycol and dimethyyl terephthalate; or bis(hydroxyethyl)terephthalate as sole reactant(s) or the preparation of a solid polymer having the sole repeating units of the structure, below, "or products thereof." [figure]

(1) Note. A polymer described as polyethylene terephthalate is presumed to be derived from the starting monomers of this subclass or to have the structure above, unless the patent otherwise specifies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

308.6+, for processes of preparing other polyesters derived from terephthalic acid or substituted forms thereof.