FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS

Description

This subclass encompasses methods and apparatus for controlling, directing, and modifying the flow characteristics of gases and liquids in practical applications. It covers devices such as diffusers, nozzles, flow control valves, and systems that use fluid dynamics principles to achieve desired flow patterns, pressure distributions, or velocity profiles. The classification includes both active and passive flow control techniques, including swirl generators, flow straighteners, and jet deflection mechanisms. F15D excludes general fluid mechanics theory and focuses on engineered means for practical flow manipulation in hydraulic, pneumatic, and general fluid systems.

Filing statistics

CPC subclass F15D recorded 5,503 patent applications worldwide between 2013 and 2023. Annual filings declined from 545 in 2013 to 263 in 2023 (-52%), peaking at 658 applications in 2018. The most active applicants in class F15 are ROBERT BOSCH (1,281 applications), SMC CORPORATION (865 applications) and HITACHI CONSTRUCTION MACHINERY COMPANY (814 applications).

Source: EPO PATSTAT, worldwide filings