US PATENT SUBCLASS 522 / 97
.~.~.~ Polyurethane has an oxygen other than as part of a urethane or carboxylic acid ester group

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~ COMPOSITIONS TO BE POLYMERIZED BY WAVE ENERGY WHEREIN SAID COMPOSITION CONTAINS A RATE-AFFECTING MATERIAL; OR COMPOSITIONS TO BE MODIFIED BY WAVE ENERGY WHEREIN SAID COMPOSITION CONTAINS A RATE-AFFECTING MATERIAL; OR PROCESSES OF PREPARING OR TREATING A SOLID POLYMER UTILIZING WAVE ENERGY {27}
90  DF  .~.~ Processes involving a polyurethane having terminal ethylenic unsaturation as reactant or as solid polymer; or compositions therefore {8}
97.~.~.~ Polyurethane has an oxygen other than as part of a urethane or carboxylic acid ester group

DEFINITION

Classification: 522/97

Polyurethane has an oxygen other than as part of a urethane or carboxylic acid ester group:

(under subclass 90) Subject matter wherein the unsaturated polyurethane contains at least one oxygen atom which is other than as an oxygen atom in a -NH-C(0)-0 or -C-C(0)-0- group.