CPC Main Group
F28F 11/00 Arrangements for sealing leaky tubes and conduits (stopping flow from or in pipes in general F16L55/10)
3 direct subcodes
Child Classifications
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- F28F 11/02 using obturating elements, e.g. washers, inserted and operated independently of each other (F28F11/06 takes precedence)
- F28F 11/04 using pairs of obturating elements, e.g. washers, mounted upon central operating rods (F28F11/06 takes precedence)
- F28F 11/06 using automatic tube obturating appliances
Top Applicants
Top 10 applicants by patent filingsfor 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