US PATENT SUBCLASS 521 / *
SYNTHETIC RESINS (Class 520, Subclass 1)


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

*SYNTHETIC RESINS (Class 520, Subclass 1) {3}
25  DF  .~> ION-EXCHANGE POLYMER OR PROCESS OF PREPARING {7}
40  DF  .~> PROCESS OF TREATING SCRAP OR WASTE PRODUCT CONTAINING SOLID ORGANIC POLYMER TO RECOVER A SOLID POLYMER THEREFROM {5}
50  DF  .~> CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}