Forming, maintaining or circulating atmospheres in heating chambers

Filing statistics

CPC F27D 7/00 belongs to the parent subclass F27D, which recorded 44,314 patent applications worldwide between 2013 and 2023. Annual filings grew from 2,923 in 2013 to 4,954 in 2023 (+69%), peaking at 4,996 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

3 direct subcodes

Child Classifications

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F27D 7/02 Supplying steam, vapour, gases or liquids
F27D 7/04 Circulating atmospheres by mechanical means
F27D 7/06 Forming or maintaining special atmospheres or vacuum within heating chambers (supplying steam, vapour, gases or liquids F27D7/02)

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