US PATENT SUBCLASS 523 / *
SYNTHETIC RESINS (Class 520, Subclass 1)


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

*SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~> PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF {71}