US PATENT SUBCLASS 264 / 4.3-- .~.~ With treatment subsequent to solid wall formation (e.g., coating, hardening, etc.)

US PATENT SUBCLASS 264 / 4.3
.~.~ With treatment subsequent to solid wall formation (e.g., coating, hardening, etc.)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999 Terms of Use

264 /	HD	PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

4	DF	ENCAPSULATING NORMALLY LIQUID MATERIAL {1}
4.1	DF	.~ Liquid encapsulation utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome) {4}
4.3		.~.~ With treatment subsequent to solid wall formation (e.g., coating, hardening, etc.) {2}
4.32	DF	.~.~.~> Microcapsule wall containing two or more layers
4.33	DF	.~.~.~> Microcapsule wall derived from synthetic polymer

DEFINITION

Classification: 264/4.3

With treatment subsequent to solid-wall formation (e.g., coating, hardening, etc.):

(under subclass 4) Subject matter wherein solid-walled microparticles are subjected to a significant chemical or physical after-treatment, e.g., heating, formaldenhyde crosslinking, etc., the recitation of "hardening the formed microcapsule" is sufficient for placement here.

(1) Note. Techniques utilized for merely recovering the microencapsulated product are not the type of after-treatment considered, e.g., filtering, precipitating, centrifuging, evaporating, distilling, sieving, etc. Drying techniques also not considered as after-treatment are spray drying, freeze drying (lyophilization), drum drying, etc.