CPC Main Group
F27B 9/00 Furnaces through which the charge is moved mechanically, e.g. of tunnel type (rotary-drum furnaces with means for agitating or moving the charge F27B7/14); Similar furnaces in which the charge moves by gravity
Filing statistics
CPC F27B 9/00 belongs to the parent subclass F27B, which recorded 32,315 patent applications worldwide between 2013 and 2023. Annual filings grew from 2,277 in 2013 to 3,505 in 2023 (+54%), peaking at 3,686 applications in 2020. The most active applicants in class F27 are POSCO (POHANG IRON AND STEEL COMPANY) (930 applications), JFE STEEL (771 applications) and PAUL WURTH (518 applications).
Source: EPO PATSTAT, worldwide filings
7 direct subcodes
Child Classifications
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- F27B 9/02 of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B 9/04 adapted for treating the charge in vacuum or special atmosphere
- F27B 9/06 heated without contact between combustion gases and charge; electrically heated
- F27B 9/12 with special arrangements for preheating or cooling the charge
- F27B 9/14 characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment (for treating continuous lengths of work F27B9/28)
- F27B 9/28 for treating continuous lengths of work
- F27B 9/30 Details, accessories or equipment specially adapted for furnaces of these types
Top Applicants
Top 10 applicants by patent filingsfor 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