DIFF Subgroup
B01J 13/20 After-treatment of capsule walls, e.g. hardening
Introduced: January 1990
Full Title
Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons > Making microcapsules or microballoons > After-treatment of capsule walls, e.g. hardening
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 1990.
Child Classifications
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