Scramjet Turbine Engine Patents: Who Leads, Where the Gaps Are 2026
- Filing activity peaked in 2019 at 7 records and has not returned to that level since, with the 2022 midpoint sitting at just 1 filing — this is a field with a burst, not a build.
- F02K and F02C dominate the IPC split (18 and 16 records respectively), meaning most claims are staked on jet/reaction propulsion and gas-turbine plant architecture, not on the mode-transition control layer itself.
- The United States receives 22 of 34 filings against 8 in China and 4 via WIPO, so a freedom-to-operate check anchored on US grants will catch most of the active claim space.
What the scramjet / TBCC patent record actually shows
Turbine-based combined cycle propulsion asks a turbojet and a scramjet to share one inlet and one flowpath, handing off between them somewhere around Mach 3. The patent record for this combination is small and uneven: 34 patent families span 2015 through the current data cut-off, with a single peak year and a long quiet stretch either side of it. That shape matters more than the raw count — it tells you the field moved in a cluster of activity rather than a steady climb.
Filing offices concentrate in the United States, with China and PCT filings a distant second and third. The IPC composition leans hard on jet/reaction propulsion (F02K) and gas-turbine plants (F02C), with turbines, aircraft equipment, and even marine propulsion picking up smaller shares — a reminder that combined-cycle thinking has migrated outside pure aerospace applications. Publication lags filing by roughly 18 months, so the flat-looking recent years are likely undercounted rather than genuinely dormant.
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Filing trend and technology composition
Two views of the same 34 families: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
A peak year, then a plateau
Filings ran to zero in 2017, climbed to a peak of 7 in 2019, then fell back toward a single filing by the 2022 midpoint. There is no sustained upward trend to point to — this looks like a technology push tied to specific programme funding rather than a broad commercial ramp.
Propulsion and turbine classes carry the weight
F02K (jet & reaction propulsion) and F02C (gas-turbine plants) together account for the large majority of records, with F01D (turbines), B64D (aircraft equipment) and smaller marine and electric-vehicle classes trailing well behind. The concentration in F02K/F02C signals that most claims sit on engine architecture and cycle design rather than on the software or control logic that manages the mode transition itself.
Shares are the percentage of the 34 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Scramjet Turbine Engine with Eureka
This page is one run against one query. Ask Eureka your own question about scramjet turbine engine and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
US11512667B2 — Anti-unstart for combined cycle high mach vehicles
Vehicles, such as aircraft, may include turbine-based combined cycle power plants (TBCC) for power to achieve high-mach speeds. An anti-unstart configuration provides control for transitioning between the amount of air directed to either engine during operation of gas turbine engine and scramjet engines, to avoid unstart during operation above sonic speeds.Filed by Rolls-Royce North American Technologies, granted 2022-11-29 — one of the few records in this set that claims the transition-control layer directly rather than the surrounding engine hardware.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN102705081A | 二元高超声速变几何进气道及设计方法与工作方式 | 54 |
| 2 | CN105156228A | 一种引射辅助式涡轮冲压组合循环发动机 | 40 |
| 3 | US8292217B2 | Hypersonic inlet systems and methods | 24 |
| 4 | US7296396B1 | Method for using variable supersonic Mach number air heater utilizing supersonic combustion | 15 |
| 5 | US20190234308A1 | High-mach vehicle cooling | 14 |
| 6 | US20190209997A1 | Fuel reformation for use in high speed propulsion systems | 13 |
| 7 | US10704466B2 | High-mach vehicle cooling | 13 |
| 8 | CN202628279U | 二元高超声速变几何进气道 | 13 |
| 9 | US20080196414A1 | Strut cavity pilot and fuel injector assembly | 13 |
| 10 | US20090313968A1 | Hypersonic Inlet Systems and Methods | 12 |
Citation counts inside this searched corpus favour older filings and are a signal of influence within the dataset, not a measure of current commercial weight.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing or FTO decision
Read alongside the ranking and trend charts, three patterns stand out in how this claim space has actually been built.
A burst, not a build
The trend does not show gradual commercial maturation. It shows a concentrated filing push around 2019, most likely tied to a specific test or funding cycle, followed by a drop-off. Treat any single-year spike in this data as programme-driven rather than as an inflection point in adoption.
US-anchored claim space
Almost two-thirds of records were filed at the USPTO. A freedom-to-operate search that stops at the US and PCT layer will still miss the China-filed eighth of the corpus, which is worth a separate pass given the country's own combined-cycle propulsion programmes.
Architecture claims dominate control claims
The bulk of filings sit in jet/reaction propulsion and gas-turbine plant classes — engine and cycle hardware. Far fewer records touch the mode-transition control problem specifically, which is the harder engineering question and the one US11512667B2 addresses directly.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to scramjet turbine engine, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Kia Motors Corporation | Hyundai Motor Company | 2 |
Only one co-assignee pair appears more than once in this dataset (Kia Motors and Hyundai Motor, at 2 shared records), suggesting most work here is filed by single entities rather than through joint development programmes.
Who holds the claim space, and where activity has gone quiet
Recent-year momentum across the named assignees is uniformly flat: every tracked organisation, from Rolls-Royce North American Technologies to Nanjing University of Aeronautics and Astronautics, shows zero filings in the latest year. That is consistent with the broader trend line rather than a sign any one player has exited.
No active filer in the most recent window
Every assignee tracked in the momentum data — including Rolls-Royce North American Technologies, Rolls-Royce plc, the US Naval Research Laboratory, and Nanjing University of Aeronautics and Astronautics — shows zero filings in the latest year. Given the 18-month publication lag, this likely understates true recent activity rather than confirming the field has stopped.
Mostly solo filers
The single strongest co-assignee pair — Kia Motors and Hyundai Motor — appears only twice. Beyond that, the corpus is largely single-assignee filings, which points to in-house propulsion R&D rather than joint ventures or shared test programmes.
Older Chinese filings anchor the citation graph
The two most-cited records in the corpus concern hypersonic inlet geometry and ejector-assisted turbine-ramjet combined cycles, both filed in China. High citation counts here reflect age and foundational inlet/cycle design rather than recent influence.
| Assignee | Recent year | YoY |
|---|---|---|
| Rolls-Royce North American Technologies Inc. | 0 | — |
| ARCHIMEDES FREIGHT INC | 0 | -100% |
| Nanjing University of Aeronautics and Astronautics | 0 | — |
| Kia Motors Corporation | 0 | — |
| US Naval Research Laboratory | 0 | — |
| Rolls-Royce plc | 0 | — |
| Hyundai Motor Company | 0 | — |
| Tsinghua University | 0 | — |
Where to take this next
The dataset points to specific follow-up questions rather than a single conclusion.
Check the China-filed eighth separately
With 8 of 34 records filed in China against 22 in the US, a US-only FTO search will miss meaningful activity, particularly around inlet geometry given the citation leaders in this set.
Explore assignee filingsWatch the control-layer claims, not just the hardware
F02K and F02C hardware claims dominate by volume, but the transition-control problem that US11512667B2 addresses is thinly claimed elsewhere — that gap is where a new filing has the clearest run.
Review key patentsTreat the 2019 peak as programme-driven
Before reading momentum into the trend line, confirm whether the 2019 spike ties to a known test or funding cycle rather than assuming organic market growth.
See filing trendQuestions practitioners ask about scramjet and TBCC patents
This dataset identifies 34 patent families published between 2015 and the mid-2026 cut-off that combine scramjet or supersonic-combustion-ramjet terms with turbine-based combined cycle or mode-transition language. That is a small, specialised corpus compared to broader gas-turbine or jet-propulsion searches. Because publication lags filing by roughly 18 months, the true count for the most recent one to two years is likely higher than currently shows in the data.
TBCC propulsion combines a conventional turbojet or turbofan for low-speed and takeoff performance with a scramjet for sustained high-Mach flight, sharing a single airframe and often a single inlet. The hard engineering problem is the mode transition — handing off thrust between the two engine types without an unstart event. Patent filings in this dataset concentrate heavily on the jet-propulsion and gas-turbine hardware (F02K and F02C) rather than on that transition-control logic, which is where representative filings like US11512667B2 sit.
Named assignees in this dataset include Rolls-Royce North American Technologies, Rolls-Royce plc, the US Naval Research Laboratory, Nanjing University of Aeronautics and Astronautics, Kia Motors and Hyundai Motor, among others. All of them show zero filings in the most recent tracked year, consistent with the dataset's flat overall trend rather than any single company having withdrawn. Kia Motors and Hyundai Motor form the only repeated co-assignee pair in the corpus.
The clearest gaps sit outside the dominant F02K and F02C hardware classes: mode-transition control software, variable-geometry inlet actuation logic, high-Mach thermal management, and unstart detection sensing all show thin direct coverage relative to core engine architecture. A handful of records even extend combined-cycle thinking into marine propulsion (B63H, B63B), suggesting the concept is more portable than the aerospace-heavy filing pattern implies. Any of these narrower branches is a more defensible place to file a first claim than the crowded engine-architecture space.
The filing trend does not show sustained growth. Activity peaked in 2019 at 7 filings, then dropped back to roughly 1 filing by the 2022 midpoint, and has stayed flat since across every tracked assignee. This pattern reads as a concentrated programme-driven filing push rather than a steadily maturing commercial technology, though the most recent one to two years are understated due to publication lag.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.