F27M 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.
Top Applicants
Top Applicants (IPC)
Class F27,2013–2023, worldwide · Source: EPO PATSTAT
- POSCO (POHANG IRON AND STEEL COMPANY) KR 885
- ZHONGYE CHANGTIAN INTERNATIONAL ENGINEERING COMPANY 670
- JFE STEEL 621
- JFE STEEL JP 492
- PAUL WURTH LU 418
- OUTOTEC (FINLAND) FI 346
- CHINA ENFI ENGINEERING CORPORATION 328
- THYSSEN KRUPP DE 310
- JINCHUAN GROUP 279
- NIPPON STEEL CORPORATION 262
Top Applicants (CPC)
Class F27,2013–2023, worldwide · Source: EPO PATSTAT
- POSCO (POHANG IRON AND STEEL COMPANY) KR 930
- JFE STEEL JP 771
- PAUL WURTH LU 518
- OUTOTEC (FINLAND) FI 436
- THYSSEN KRUPP DE 422
- REFRACTORY INTELLECTUAL PROPERTY & COMPANY AT 370
- THYSSENKRUPP INDUSTRIAL SOLUTIONS DE 341
- JFE STEEL 323
- PRIMETALS TECHNOLOGIES AUSTRIA AT 310
- ZHONGYE CHANGTIAN INTERNATIONAL ENGINEERING COMPANY 299