US PATENT SUBCLASS 521 / 138
.~.~.~ At least one polymer is derived from a polycarboxylic acid or derivative and a polyol or wherein the polymer-forming system containing the same type of reactants

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
134  DF  .~.~ Cellular product derived from two or more solid polymers or from at least one solid polymer and at least one polymer-forming system {6}
138.~.~.~ At least one polymer is derived from a polycarboxylic acid or derivative and a polyol or wherein the polymer-forming system containing the same type of reactants

DEFINITION

Classification: 521/138

At least one polymer is derived from a polycarboxylic acid or derivative and polyol or wherein the polymer-forming system contains the same type of reactants:

(under subclass 134) Subject matter wherein at least one of the polymers is the reaction product of a polycarboxylic acid or derivative and a polyol.

(1) Note. Polymeric products which are the result of the

polymerization of a polycarboxylic acid as a sole reactant are included in this subclass.

SEE OR SEARCH CLASS

528, Synthetic Resins or Natural Rubbers, the Glossary, for a definition of the term "polycarboxylic acid or derivative".