DIFF Main Group
F28F 1/00 Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Tubular elements; Assemblies of tubular elements
CPC: Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00)
Full Title
Full titles differ between systems:
IPC:
Tubular elements; Assemblies of tubular elements
CPC:
Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00)
Of 5 combined children, 3 exist in both systems.
2 codes are CPC-only extensions.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F28F 1/02 Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence) +3 CPC IPC+CPC Available in IPC and CPC
- F28F 1/08 Tubular elements crimped or corrugated in longitudinal section IPC+CPC Available in IPC and CPC
- F28F 1/10 Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses (crimped or corrugated elements F28F1/06, F28F1/08) +1 CPC IPC+CPC Available in IPC and CPC
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