US PATENT SUBCLASS 428 / 402.2
.~.~ Microcapsule with fluid 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}
402.2.~.~ Microcapsule with fluid core (includes liposome) {1}
402.21  DF  .~.~.~> Solid-walled microcapsule from synthetic polymer {1}

DEFINITION

Classification: 428/402.2

Microcapsule with fluid core (includes liposome):

(under subclass 402) Subject matter wherein the microcapsule is comprised of a Fluid core (at ambient temperatures) encapsulated by a solid wall or shell.

(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

264, Plastic and Nonmetallic Article Shaping or Treating: Processes,

4.1+, for the process of encapsulating a liquid.

521, Synthetic Resins or Natural Rubbers, in particular

76, preparing a cellular product or precursor thereof utilizing a stated ingredient which is a solid particle containing a fluid encapsulated therein. See also (4) Note under subclass 50 in conjunction with this.