F28F 9/16 by permanent joints, e.g. by rolling (metal-working procedures in general B21, B32; particularly B21D39/06, B23K)
Introduced: September 1968
Title
Titles differ between systems:
IPC: by permanent joints, e.g. by rolling
CPC: by permanent joints, e.g. by rolling (metal-working procedures in general B21, B32; particularly B21D39/06, B23K)
Full Title
Full titles differ between systems:
Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings > Header boxes; End plates > Arrangements for sealing elements into header boxes or end plates > by permanent joints, e.g. by rolling
Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings > Header boxes; End plates > Arrangements for sealing elements into header boxes or end plates > by permanent joints, e.g. by rolling (metal-working procedures in general B21, B32; particularly B21D39/06, B23K)
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
Child Classifications
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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