CPC Main Group
F23L 13/00 Construction of valves or dampers for controlling air supply or draught
Filing statistics
CPC F23L 13/00 belongs to the parent subclass F23L, which recorded 12,448 patent applications worldwide between 2013 and 2023. Annual filings grew from 880 in 2013 to 1,048 in 2023 (+19%), peaking at 1,464 applications in 2020. The most active applicants in class F23 are GE (GENERAL ELECTRIC COMPANY) (2,581 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (1,180 applications) and SIEMENS (1,157 applications).
Source: EPO PATSTAT, worldwide filings
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