Ram Air Turbine Patents: Top Companies & Filing Trends 2026
Ram Air Turbine and Emergency Power Patents: Who Holds the Field
82.1% of all 364 records sit with just five assignees — this is one of the more concentrated corners of aerospace emergency-power IP. Filings ran at 20 in 2017 and peaked at 29 in 2019. Using 2021 (12) through 2024 (2) — the last year the data treats as complete — filings fell 83% over that three-year span, consistent with a field where the core deployment mechanics are already well-claimed by incumbents.
- 1HAMILTON SUNDSTRAND CORP187
- 2PRATT & WHITNEY CANADA CORP39
- 3SUNDSTRAND CORP31
- 4ROLLS ROYCE PLC24
- 5RTX CORP18
See the full ram air turbines and emergency power analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about ram air turbine patents
Who holds the most patents on ram air turbine technology?
One assignee holds 187 of the 364 records in this dataset, far ahead of the rest of the field. The next four ranked assignees bring the top-five combined total to 299 records, or 82.1% of all records in scope. That concentration reflects decades of continuous filing by a small group of legacy aerospace suppliers around the core deployment and generator mechanisms.
Is ram air turbine patent activity growing or shrinking?
Filing activity peaked in 2019 at 29 records and has since declined; using the last three complete years, filings fell from 12 in 2021 to 2 in 2024, an 83% drop. That said, publication typically lags filing by about 18 months, so the most recent one to two years in any dataset understate real activity. The trend still points to a maturing field rather than an expanding one.
What does US11732698B1 actually claim?
US11732698B1, assigned to Hamilton Sundstrand and published in 2023, covers a ram air turbine deployment actuator assembly with an integrated electric heater element in the actuator housing. The heater warms hydraulic fluid, including fluid in an integrated hydraulic snubbing loop, to reduce its viscosity and shorten deployment time in cold conditions. It is a narrow but concrete claim around cold-weather deployment performance, not a claim over the general deployment mechanism.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Ram Air Turbines and Emergency Power covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.