in which the medium condenses and evaporates, e.g. heat pipes

Introduced: January 1985

Title

Titles differ between systems:

IPC: in which the medium condenses and evaporates, e.g. heat-pipes

CPC: in which the medium condenses and evaporates, e.g. heat pipes

Full Title

Full titles differ between systems:

IPC:

Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls > in which the medium condenses and evaporates, e.g. heat-pipes

CPC:

Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls > in which the medium condenses and evaporates, e.g. heat pipes

CPC subdivides this area 7x more granularly than IPC with 11 additional codes.

11 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1995.

Child Classifications

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F28D 15/0208 CPC only CPC only
F28D 15/0233 CPC only CPC only
F28D 15/0241 CPC only CPC only
F28D 15/025 CPC only CPC only
F28D 15/0258 CPC only CPC only
F28D 15/0266 CPC only CPC only
F28D 15/0275 CPC only CPC only
F28D 15/0283 CPC only CPC only
F28D 15/04 with tubes having a capillary structure since 1995 +2 CPC IPC+CPC Available in IPC and CPC
F28D 15/06 Control arrangements therefor since 1995 IPC+CPC Available in IPC and CPC
F28D 2015/0216 2nd only CPC only CPC only
F28D 2015/0225 2nd only CPC only CPC only
F28D 2015/0291 2nd only CPC only CPC only

Top Applicants

Top Applicants (IPC)

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

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

Top Applicants (CPC)

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

VALEO SYSTEMES THERMIQUES FR 1,945
MITSUBISHI ELECTRIC CORPORATION JP 1,518
MAHLE INTERNATIONAL DE 1,120
ALFA LAVAL SE 1,085
HANON SYSTEMS KR 939
DENSO CORPORATION JP 900
LG ELECTRONICS KR 861
HAMILTON SUNDSTRAND US 795
DAIKIN INDUSTRIES JP 608
DENSO CORPORATION 537