US PATENT SUBCLASS 427 / 213.3
.~ Solid encapsulation process utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome)

Current as of: June, 1999
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427 /   HD   COATING PROCESSES

212  DF  PARTICLES, FLAKES, OR GRANULES COATED OR ENCAPSULATED {5}
213.3.~ Solid encapsulation process utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome) {4}
213.31  DF  .~.~> With post-treatment of encapsulant or encapsulating material (e.g., further coating, hardening, etc.) {1}
213.34  DF  .~.~> Solid-walled microcapsule formed by in situ polymerization
213.35  DF  .~.~> Solid-walled microcapsule formed from gelatin or derivative thereof
213.36  DF  .~.~> Solid-walled microcapsule formed from preformed synthetic polymer

DEFINITION

Classification: 427/213.3

Solid encapsulation process utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome):

(under subclass 212) Subject matter wherein a medium in the form of an emulsion or dispersion is used to affect encapsulation of the solid; the medium may contain one or

more polymers, polymer precursors, monomers or other encapsulating materials; e.g., gelatin wax, etc.

(1) Note. The classification of a patent reciting the encapsulation of a core material with no reference to its physical state, i.e., solid, liquid or gas, the assumption is made that the core material is solid and therefore classified in the Class 427 and a suggested cross into Class 264, subclasses 4+.

(2) 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.