US PATENT SUBCLASS 530 / 421
.~.~.~.~ Polymeric, e.g., polyethylene glycol, etc.

Current as of: June, 1999
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530 /   HD   CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF

350  DF  PROTEINS, I.E., MORE THAN 100 AMINO ACID RESIDUES {14}
412  DF  .~ Separation or purification {6}
418  DF  .~.~ Precipitation {1}
419  DF  .~.~.~ With added material {2}
421.~.~.~.~ Polymeric, e.g., polyethylene glycol, etc.

DEFINITION

Classification: 530/421

Polymeric, e.g., polyethylene glycol, etc.:

(under subclass 419) Process in which the added material is a natural or synthetic polymer.