F27D DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
Introduced: September 1968
Description
F27D covers structural components, functional elements, and auxiliary devices that are applicable across multiple types of furnaces, kilns, ovens, and retorts. This includes features such as refractory linings, insulation systems, hearths, grates, burners, air supply mechanisms, temperature control devices, and structural supports that are not specific to a single furnace type. Details specific to particular furnace categories (e.g., blast furnace components used only in blast furnaces) are classified in the relevant specialized subclasses instead. This subclass serves as a repository for multi-purpose furnace accessories and shared technical solutions that enhance efficiency, durability, or operational capability across diverse high-temperature processing equipment.
Of 15 combined children, 14 exist in both systems.
1 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.
3 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F27D 11/00 Arrangement of elements for electric heating in or on furnaces IPC+CPC Available in IPC and CPC
- F27D 13/00 Apparatus for preheating charges; Arrangements for preheating charges +3 CPC IPC+CPC Available in IPC and CPC
- F27D 15/00 Handling or treating discharged material; Supports or receiving chambers therefor IPC+CPC Available in IPC and CPC
- F27D 17/00 Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases IPC+CPC Available in IPC and CPC
- F27D 21/00 Arrangement of monitoring devices; Arrangement of safety devices +7 CPC IPC+CPC Available in IPC and CPC
- F27D 27/00 Stirring devices for molten material (charging or discharging liquid or molten material F27D3/14) since 2010 +2 CPC IPC+CPC Available in IPC and CPC
- F27D 5/00 Supports, screens or the like for the charge within the furnace +9 CPC IPC+CPC Available in IPC and CPC
- F27D 7/00 Forming, maintaining or circulating atmospheres in heating chambers IPC+CPC Available in IPC and CPC
- F27D 9/00 Cooling of furnaces or of charges therein (casings, linings, walls or roofs incorporating cooling arrangements F27D1/12) +2 CPC IPC+CPC Available in IPC and CPC
- F27D 99/00 Subject matter not provided for in other groups of this subclass since 2010 +5 CPC IPC+CPC Available in IPC and CPC
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