US PATENT SUBCLASS 521 / 48
.~.~ Treating polyester

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
40  DF  .~ PROCESS OF TREATING SCRAP OR WASTE PRODUCT CONTAINING SOLID ORGANIC POLYMER TO RECOVER A SOLID POLYMER THEREFROM {5}
48.~.~ Treating polyester {1}
48.5  DF  .~.~.~> Treating with alcohol

DEFINITION

Classification: 521/48

Treating polyester:

(under subclass 40) Subject matter wherein the scrap or waste product contains a polyester whose polymer backbone was derived through the direct formation of the ester linkage, i.e., - O, and must link through the carbonyl group.

(1) Note. Polymerization of di- or higher esters of polycarboxylic acids, lactones, lactides, glycolide, hydroxy-substituted carboxylic acids or derivatives; or condensation of polyols with polycarboxylic acids or

derivatives and polyketenes all produce polyesters proper for this subclass.

(2) Note. A mere disclosure of a polyester in which the method of making said polyesters is not claimed or disclosed is presumed to lie within the definition of this subclass.