One assignee holds 242 of the 329 records in this dataset, making it the clear leader by a wide margin. The top 5 of the 32 ranked assignees together account for 295 records, or 89.7% of everything in scope. That leaves a long tail of companies and individual inventors with only a handful of filings each, so anyone entering this space should expect to compete primarily against a small number of well-resourced incumbents rather than a fragmented field.

Filings rose from essentially nothing in 2017 to a peak of 118 records in 2022, then declined to 35 by 2024 — a 50% drop over that three-year window. However, patent publication typically lags actual filing by around 18 months, so the 2025 and 2026 figures in any dataset are still incomplete. It is not safe to conclude the field is cooling based on the most recent one or two years alone; the 2022 peak and the 2021-2024 decline are the most reliable trend signals available right now.

Most records combine electric vehicle propulsion claims (IPC class B60L, 54.7% of records) with aircraft equipment claims (B64D, 41.6%), meaning battery thermal management here is usually framed as a systems-integration problem rather than a standalone battery-chemistry one. Battery and cell-specific claims (H01M) appear in 32.5% of records, aeroplane and helicopter structural claims (B64C) in 28.3%, and power supply and grid claims (H02J) in 22.2%. Because records often carry multiple IPC classes, these shares add up to more than 100% of the 329 records.

The thinner IPC classes — ground installation equipment (B64F at 17.6%), electric and magnetic measurement (G01R at 8.2%), and control of non-electric variables (G05D at 6.4%) — suggest lighter claim density around ground-support charging infrastructure, in-flight measurement, and automated thermal control logic compared to the dominant propulsion and equipment classes. Thermal runaway propagation control and cold-soak preconditioning are specific sub-areas that appear underrepresented relative to core charging and propulsion claims. A focused prior-art search on these narrower branches is more likely to surface open claim space than a search across the whole field.

US20200055610A1, filed by RTX Corporation and published in February 2020, is the most-cited record in this dataset with 32 citations. It claims a hybrid electric aircraft battery charging system that switches charging current based on the gas turbine engine's operational state — charging at a higher rate from an external input, then dropping to a lower generator-driven rate specifically when the aircraft is in a taxi state. Its high citation count signals strong influence over later filings in flight-phase-aware charging control, making it a reference point for any freedom-to-operate review touching adaptive charging logic.