INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS

Description

F27M serves as an indexing classification for organizing patents related to the operational and physical characteristics of furnaces, kilns, ovens, and retorts, as well as their processed materials (charges). This subclass provides systematic cross-referencing for documents addressing specific aspects such as heating methods, charge composition, furnace design features, or operational parameters rather than constituting a primary classification category itself. Patents are typically assigned to F27M in conjunction with more specific technical subclasses (e.g., F27B, F27C, F27D) to enable comprehensive retrieval by patent practitioners and examiners searching across multiple technical dimensions of thermal processing equipment.

Of 3 combined children, 0 exist in both systems.

3 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

This code exists only in CPC.

Diff view requires codes present in both systems.

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