Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
F28F 11/04

using pairs of obturating elements, e.g. washers, mounted upon central operating rods (F28F11/06 takes precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: using pairs of obturating elements, e.g. washers, mounted upon central operating rods

CPC: using pairs of obturating elements, e.g. washers, mounted upon central operating rods (F28F11/06 takes precedence)

Full Title

Full titles differ between systems:

IPC:

Arrangements for sealing leaky tubes or conduits > using pairs of obturating elements, e.g. washers, mounted upon central operating rods

CPC:

Arrangements for sealing leaky tubes and conduits (stopping flow from or in pipes in general F16L55/10) > using pairs of obturating elements, e.g. washers, mounted upon central operating rods (F28F11/06 takes precedence)

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

Class F28,2013–2023, worldwide · Source: EPO PATSTAT

  1. VALEO SYSTEMES THERMIQUES FR 1,902
  2. MITSUBISHI ELECTRIC CORPORATION JP 1,327
  3. GREE ELECTRIC APPLIANCES 1,152
  4. MAHLE INTERNATIONAL DE 999
  5. ALFA LAVAL SE 960
  6. HANON SYSTEMS KR 917
  7. DENSO CORPORATION 905
  8. DENSO CORPORATION JP 802
  9. CHINESE ACADEMY OF SCIENCES 787
  10. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 762

Top Applicants (CPC)

Class F28,2013–2023, worldwide · Source: EPO PATSTAT

  1. VALEO SYSTEMES THERMIQUES FR 1,945
  2. MITSUBISHI ELECTRIC CORPORATION JP 1,518
  3. MAHLE INTERNATIONAL DE 1,120
  4. ALFA LAVAL SE 1,085
  5. HANON SYSTEMS KR 939
  6. DENSO CORPORATION JP 900
  7. LG ELECTRONICS KR 861
  8. HAMILTON SUNDSTRAND US 795
  9. DAIKIN INDUSTRIES JP 608
  10. DENSO CORPORATION 537