CPC Main Group
F04B 53/00 Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
15 direct subcodes
Child Classifications
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- F04B 53/02 Packing the free space between cylinders and pistons
- F04B 53/04 Draining
- F04B 53/06 Venting
- F04B 53/08 Cooling; Heating; Preventing freezing
- F04B 53/10 Valves; Arrangement of valves
- F04B 53/14 Pistons, piston-rods or piston-rod connections
- F04B 53/16 Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B 53/18 Lubricating
- F04B 53/20 Filtering
- F04B 53/22 Arrangements for enabling ready assembly or disassembly
Top Applicants
Top 10 applicants by patent filingsfor class F04, 2013–2023, worldwide · Source: EPO PATSTAT
- LG ELECTRONICS KR 3,855
- ROBERT BOSCH DE 3,549
- GREE ELECTRIC APPLIANCES 2,273
- GE (GENERAL ELECTRIC COMPANY) US 2,126
- MITSUBISHI ELECTRIC CORPORATION JP 1,881
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,866
- SAFRAN AIRCRAFT ENGINES FR 1,499
- MITSUBISHI HEAVY INDUSTRIES JP 1,258
- TOYOTA INDUSTRIES CORPORATION JP 1,247
- ATLAS COPCO AIRPOWER BE 1,168