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DIFF Subgroup
F17D 5/04

by means of a signalling fluid enclosed in a double wall

Introduced: July 1974

Full Title

Full titles differ between systems:

IPC:

Protection or supervision of installations > Preventing, monitoring, or locating loss > by means of a signalling fluid enclosed in a double wall

CPC:

Protection or supervision of installations (arrangements for protecting foundations E02D31/00; protecting pipes from damage or internal or external wear F16L57/00, against corrosion and scale F16L58/00; investigation of the fluid-tightness of structures G01M3/00) > Preventing, monitoring, or locating loss > by means of a signalling fluid enclosed in a double wall

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

Top Applicants

Top Applicants (IPC)

Class F17,2013–2023, worldwide · Source: EPO PATSTAT

  1. DAEWOO SHIPBUILDING & MARINE ENGINEERING COMPANY KR 1,622
  2. GAZ TRANSPORT ET TECHNIGAZ FR 1,588
  3. L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE FR 1,470
  4. SAMSUNG HEAVY INDUSTRIES KR 1,287
  5. HYUNDAI HEAVY INDUSTRIES COMPANY KR 989
  6. TOYOTA MOTOR CORPORATION 830
  7. LINDE DE 703
  8. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 666
  9. ROBERT BOSCH DE 654
  10. BMW (BAYERISCHE MOTOREN WERKE) DE 511

Top Applicants (CPC)

Class F17,2013–2023, worldwide · Source: EPO PATSTAT

  1. GAZ TRANSPORT ET TECHNIGAZ FR 1,718
  2. L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE FR 1,633
  3. DAEWOO SHIPBUILDING & MARINE ENGINEERING COMPANY KR 1,570
  4. SAMSUNG HEAVY INDUSTRIES KR 1,174
  5. HYUNDAI HEAVY INDUSTRIES COMPANY KR 988
  6. LINDE DE 757
  7. ROBERT BOSCH DE 696
  8. BMW (BAYERISCHE MOTOREN WERKE) DE 523
  9. TOYOTA MOTOR CORPORATION JP 515
  10. KAWASAKI HEAVY IND JP 456