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IPC Subgroup
F27D 11/02

Ohmic resistance heating

Introduced: September 1968

Last revised: January 2006

Full Title

Arrangement of elements for electric heating in or on furnaces > Ohmic resistance heating

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

1 direct subcode

Child Classifications

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  • F27D 11/04 with direct passage of current through the material being heated

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