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IPC Subgroup
F27D 7/04

Circulating atmospheres by mechanical means

Introduced: September 1968

Last revised: January 2006

Full Title

Forming, maintaining or circulating atmospheres in heating chambers > Circulating atmospheres by mechanical means

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
FURNACES; KILNS, OVENS OR RETORTS
Subclass:
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

Filing statistics

IPC F27D 7/04 belongs to the parent subclass F27D, which recorded 110,840 patent applications worldwide between 2013 and 2023. Annual filings grew from 5,443 in 2013 to 16,632 in 2023 (+206%). The most active applicants in class F27 are POSCO (POHANG IRON AND STEEL COMPANY) (885 applications), ZHONGYE CHANGTIAN INTERNATIONAL ENGINEERING COMPANY (670 applications) and JFE STEEL (621 applications).

Source: EPO PATSTAT, worldwide filings

Top Applicants

Top 10 applicants by patent filingsfor class F27, 2013–2023, worldwide · Source: EPO PATSTAT

  1. POSCO (POHANG IRON AND STEEL COMPANY) KR 885
  2. ZHONGYE CHANGTIAN INTERNATIONAL ENGINEERING COMPANY 670
  3. JFE STEEL 621
  4. JFE STEEL JP 492
  5. PAUL WURTH LU 418
  6. OUTOTEC (FINLAND) FI 346
  7. CHINA ENFI ENGINEERING CORPORATION 328
  8. THYSSEN KRUPP DE 310
  9. JINCHUAN GROUP 279
  10. NIPPON STEEL CORPORATION 262