A variable area fan nozzle changes the exit area of the bypass duct in flight, letting an engine adjust the jet velocity ratio between its core and bypass streams for different phases of flight. This matters for geared turbofan designs in particular, where efficiency depends on balancing fan speed against core exhaust velocity. The patent record in this space covers both the mechanical actuation of the nozzle (petal mechanisms, synchronization shafts) and the operating logic that sets area schedules, which is why claims span multiple IPC classes including F02K, F02C and F01D.

The assignee ranking for this dataset is concentrated, with the leading assignee alone holding 25 of the 86 records in scope and the top five combined accounting for 59.3% of all records. These are long-established aerospace and propulsion companies rather than recent entrants. Beyond the top ten assignees, who together hold 70.9% of records, the field has a long tail of universities and individual inventors filing one or two records each.

Filing peaked in 2019 at 7 records in this dataset and has narrowed since, with the last complete year-over-year comparison showing a drop from 6 filings in 2021 to 3 in 2024, a -50% change. However, publication typically lags filing by around 18 months, so the 2025 and 2026 figures are still incomplete and should not be read as confirming a continued decline. A clearer picture of the most recent years will only emerge as those filings publish.