US PATENT SUBCLASS 428 / 402.24
.~.~ Microcapsule with solid core (includes liposome)

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}
402.24.~.~ Microcapsule with solid core (includes liposome)

DEFINITION

Classification: 428/402.24

Microcapsule with solid core (includes liposome):

(under subclass 402) Subject matter wherein the microcapsule contains solid core, e.g., a microcapsular opacifier containing titanium dioxide encapsulated with urea-formaldehyde polymer shell, etc.

(1) Note. Liposomes are formed of mesomorphic walls (i.e., a state of matter intermediate between crystalline solid and normal isotropic liquid) and are classified here based on their solid characteristics.

SEE OR SEARCH CLASS

427, Coating Processes,

213.3+, for solid encapsulation, e.g., microencapsulating a solid with a microcapsule wall derived from a synthetic polymer, etc. However, if the core material is disclosed to be an expanding (blowing) agent see Class 521, subclass 50, (4) Note for limitations to those subclasses.