US PATENT SUBCLASS 525 / 54.21
.~.~.~ Cellulose or derivative as chemical reactant

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {4}
50  DF  .~ MIXING OF TWO OR MORE SOLID POLYMERS; MIXING OF SOLID POLYMER OR SICP WITH SICP OR SPFI; MIXING OF SICP WITH AN ETHYLENIC AGENT; MIXING OF SOLID POLYMER WITH A CHEMICAL TREATING OR ETHYLENIC AGENT; OR PROCESSES OF FORMING OR REACTING; OR THE RESULTANT PRODUCT OF ANY OF THE ABOVE OPERATIONS {32}
54.2  DF  .~.~ Previously formed solid polymer chemically reacted with carbohydrate or derivative {2}
54.21.~.~.~ Cellulose or derivative as chemical reactant {2}
54.22  DF  .~.~.~.~> Previously formed solid polymer is derived from N=C=X reactant or contains N=C=X group wherein X is chalcogen
54.23  DF  .~.~.~.~> Previously formed solid polymer is derived from ethylenically unsaturated reactants only

DEFINITION

Classification: 525/54.21

Cellulose or derivative as chemical reactant:

(under subclass 54.2) Subject matter wherein cellulose or a derivative of cellulose (e.g., carboxy methyl cellulose, etc.) is chemically reacted with a previously formed solid polymer.

SEE OR SEARCH CLASS

528, Synthetic Resins or Natural Rubbers,

35, for the definition of cellulose or derivative.