CPC Main Group
F23L 13/00 Construction of valves or dampers for controlling air supply or draught
4 direct subcodes
Child Classifications
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- F23L 13/02 pivoted about a single axis but having not other movement (formed as linked slats each pivoted about an axis F23L13/08)
- F23L 13/06 slidable only
- F23L 13/08 operating as a roller blind; operating as a venetian blind
- F23L 13/10 having a compound movement involving both sliding and pivoting
Top Applicants
Top 10 applicants by patent filingsfor class F23, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,581
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,180
- SIEMENS DE 1,157
- GE (GENERAL ELECTRIC COMPANY) 994
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 769
- MITSUBISHI HEAVY INDUSTRIES JP 701
- MITSUBISHI HITACHI POWER SYSTEMS JP 695
- RAYTHEON TECHNOLOGIES CORPORATION US 587
- NINGBO FOTILE KITCHENWARE COMPANY 543
- GENERAL ELECTRIC TECHNOLOGY CH 490