US PATENT SUBCLASS 428 / 402.21
.~.~.~ Solid-walled microcapsule from synthetic polymer

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

357  DF  COATED OR STRUCTUALLY DEFINED FLAKE, PARTICLE, CELL, STRAND, STRAND PORTION, ROD, FILAMENT, MACROSCOPIC FIBER OR MASS THEREOF {5}
402  DF  .~ Particulate matter (e.g., sphere, flake, etc.) {3}
402.2  DF  .~.~ Microcapsule with fluid core (includes liposome) {1}
402.21.~.~.~ Solid-walled microcapsule from synthetic polymer {1}
402.22  DF  .~.~.~.~> Addition polymer from unsaturated monomers only

DEFINITION

Classification: 428/402.21

Solid-walled microcapsule from synthetic polymer:

(under subclass 402.2) Subject matter wherein the microcapsule wall contains at least one synthetic polymer (see Class 520, subclass 1 for a definition to synthetic polymer).

(1) Note. The chemical modification of a natural product does not constitute a synthetic resin, e.g., the reaction of cellulose with toluene diisocyanate, etc. However, the addition of certain specified reactants, e.g., a polyol to the cellulose and a diisocyanate would constitute a synthetic resin. See Class 527, subclass 100 for a definitive explanation.