Scramjet Aerodynamics Patents: Who Leads, Where the Gaps Are 2026
- Filing peaked in 2017 at 7 records and has not returned to that level since, with the 2022 midpoint at just 2 — this is a narrow, largely settled filing field rather than a growing one.
- A single cavity-flow suppression family (curved rear-face geometry) accounts for the most-cited records in the set, spanning a US application, a US grant and a WIPO/PCT filing from the same underlying invention.
- Co-assignee activity is concentrated in one cluster, JSAC LLC, COHEN(IL) and DAS SUDIP recur together across the strongest co-filing pairs in the dataset.
A small, technically dense field around cavity flow and isolator control
Scramjet aerodynamics patenting sits at the intersection of high-speed inlet design, isolator shock-train management and nozzle expansion flow. The corpus behind this page is small by patent-landscape standards — 13 published families — which is itself informative: this is a field where a handful of inventions, not a broad wave of filers, define the claim space. The dominant technical thread is cavity flow oscillation suppression, a problem that shows up wherever an open cavity (fuel injector recess, flameholder, or instrumentation port) sits inside a supersonic or hypersonic flow path.
Filing activity is front-loaded rather than climbing. The peak year on record is 2017, and by the 2022 midpoint annual output had fallen to a fraction of that level. Because publication typically lags filing by around 18 months, the most recent year in any trend line understates true activity — but even allowing for that lag, this looks like a field where the core claim space was staked out early and has not since attracted a second wave of entrants.
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Filing trend and technology composition
Thirteen patent families, filed mostly through the US receiving office, cluster around a small set of IPC subclasses that point to acoustic and flow-control engineering rather than broad aerospace structural claims.
A 2017 peak with no second wave
Filings ran at 7 in 2017, the high point of the dataset, then declined toward a midpoint of 2 in 2022. The pattern reads as a single concentrated filing event by a small group of related assignees, rather than sustained multi-year investment across the industry.
Fluid flow control and acoustics dominate the classification mix
F15D (fluid flow control) leads at 7 records, followed closely by G10K (acoustics & sound generation) at 6 and G01H (vibration/sound measurement) at 5. G02B (optical elements) also appears at 5, likely tied to flow-diagnostic instrumentation, while B61D (railway vehicle bodies) shows up 4 times — an unusual adjacency worth checking case-by-case rather than assuming direct relevance to airframe scramjet work.
Shares are the percentage of the 13 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe most-cited record in this set targets cavity flow oscillation
Method and cavity for suppression of cavity flow oscillations and acoustic loads using curved rear face
Pressure oscillations or acoustic loads over an open type cavity having a front face an upper edge of which constitutes a leading edge and having a rear face an upper edge of which constitutes a trailing edge are reduced by applying curvature to the rear face so as to present a convex curved surface internal to the cavity. In one embodiment, a cross-section through a longitudinal axis of the convex curved surface describes part of an ellipse.Filed by JSAC LLC; the same invention appears across a US application, a US grant and a WIPO/PCT filing, which is why it dominates the citation table.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20190040883A1 | Method and cavity for suppression of cavity flow oscillations and acoustic loads using curved rear face | 5 |
| 2 | US10823207B2 | Method and cavity for suppression of cavity flow oscillations and acoustic loads using curved rear face | 5 |
| 3 | WO2017134666A1 | Method and cavity for suppression of cavity flow oscillations and acoustic loads using curved rear face | 3 |
| 4 | US11519779B1 | Evanescent field coupled shock wave detection systems and methods | 2 |
Citation counts are drawn from a searched corpus and favour older, earlier-filed records; treat them as a signal of influence on later filings, not as a measure of current commercial importance.
Publication numbers are shown where the record carries one (4 of 4 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say about where this field stands
Three patterns stand out once the family counts, classification spread and co-filing structure are put side by side.
The peak has passed, not arrived
Filing activity ran highest in 2017 and has declined toward zero in the most recent year on record. Even accounting for publication lag, there is no sign of a renewed filing wave; this looks like a field where the core inventive work was done and claimed within a short window.
Flow control and acoustics, not airframe structure
The classification mix is weighted toward fluid flow control (F15D), acoustics (G10K) and vibration measurement (G01H) rather than aircraft body classes. This tells a filer that the active claim territory is the physics of cavity and shock-train behaviour, not the surrounding vehicle structure.
One cluster of named inventors drives most of the record
Of 5 co-assignee pairs identified, the three strongest all involve the same three names — JSAC LLC, COHEN(IL) and DAS SUDIP — appearing together repeatedly. That concentration suggests the foundational cavity-flow claims trace back to a single working group rather than several independent labs.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to scramjet aerodynamics, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| JSAC LLC | COHEN(IL) | 7 |
| JSAC LLC | DAS SUDIP | 6 |
| COHEN(IL) | DAS SUDIP | 6 |
| JSAC LLC | DAS SUDIP NAIHATI | 1 |
| COHEN(IL) | DAS SUDIP NAIHATI | 1 |
Co-assignee pairs cluster almost entirely around one group of names, which is unusual for a field with 13 separate families — it points to a small originating team rather than a fragmented industry effort.
A short list of named assignees, none currently active
Recent-year momentum data shows every tracked assignee at zero filings in the latest year, consistent with the broader decline from the 2017 peak. The named organisations range from a small propulsion-focused entity to a major industrial conglomerate and an academic institution.
JSAC LLC
Appears at the centre of the strongest co-assignee pairs in the dataset and is the named assignee on the most-cited cavity-flow suppression family, filed across US and WIPO/PCT routes.
COHEN(IL) / DAS SUDIP
These two names co-occur with JSAC LLC across the dataset's strongest co-assignee pairs, indicating a consistent inventing team behind the core cavity-flow oscillation work rather than separate competing filers.
General Electric
Listed among the tracked assignees with no filings in the latest year. Its presence signals industrial interest in scramjet-adjacent flow control, though the dataset shows no recent activity to characterise its current strategy.
Graphic Era Deemed to be University
The only assignee in the set with an explicit year-on-year decline figure, dropping to zero in the latest year from prior activity — consistent with the dataset's overall pattern of tapering filings after 2017.
| Assignee | Recent year | YoY |
|---|---|---|
| JSAC LLC | 0 | — |
| COHEN(IL) | 0 | — |
| DAS SUDIP | 0 | — |
| INNOVEERING LLC | 0 | — |
| General Electric Company | 0 | — |
| GRAPHIC ERA DEEMED TO BE UNIV | 0 | -100% |
| DAS SUDIP NAIHATI | 0 | — |
Where to take this analysis
The dataset points to a narrow, largely settled claim space around cavity-flow suppression, with clearer openings in adjacent measurement and structural branches.
Check freedom-to-operate around curved-cavity geometry
The most-cited family's curved rear-face approach to cavity flow oscillation appears across three related filings; any new cavity or flameholder design should be checked against its specific geometric claims before committing to a shape.
Run a claim comparison in EurekaTrack the JSAC / Cohen / Das Sudip cluster for expiry and licensing
With filing activity at zero in the latest year across all named assignees, some of the earliest cavity-flow claims from this group may be approaching points where licensing or design-around becomes more attractive.
Monitor assignee activity in EurekaExplore the under-claimed measurement and structural branches
Optical and vibration-based flow diagnostics, and additive-manufactured flow-control inserts, show thinner coverage than the core cavity-flow cluster and may offer more open filing space.
Explore white space in EurekaCommon questions about scramjet aerodynamics patents
This landscape identifies 13 published patent families matching scramjet inlet, isolator and nozzle expansion flow terms between 2015 and mid-2026. That is a small corpus compared with most propulsion sub-fields, reflecting how specialised and recent commercial scramjet development still is. Because publication lags filing by roughly 18 months, a small number of additional filings from the last year or two are likely not yet visible in the count.
The dataset's strongest signal is a cluster of related names — JSAC LLC, COHEN(IL) and DAS SUDIP — who appear together across the top co-assignee pairs and are behind the most-cited cavity flow oscillation suppression family. General Electric and an Indian academic institution, Graphic Era Deemed to be University, also appear as named assignees, though neither shows recent filing activity. No assignee in this set has filed in the most recent tracked year.
The evidence shows filing activity peaking at 7 records in 2017 before declining toward a midpoint of just 2 by 2022, with zero in the latest year. This pattern is consistent with a concentrated filing event by a small originating group rather than sustained industry-wide investment; once the core cavity-flow and isolator claims were filed, follow-on filing appears to have tapered rather than expanded.
US20190040883A1, assigned to JSAC LLC, claims a method and cavity design that reduces pressure oscillations and acoustic loads over an open cavity by giving the cavity's rear face a convex curved internal surface, in one embodiment shaped as part of an ellipse. It is the most-cited record in this dataset, and the same underlying invention was also filed as a US grant (US10823207B2) and a WIPO/PCT application (WO2017134666A1). Anyone designing a flameholder, injector recess or instrumentation cavity for supersonic flow should check this specific curved-geometry claim before finalising a shape.
The IPC composition shows dense coverage in fluid flow control (F15D) and acoustics (G10K, G01H), but thinner coverage in optical flow diagnostics, additive-manufactured flow-control components, and structural approaches to acoustic load reduction outside cavity geometry. These adjacent branches sit close to the core cluster's claims without directly overlapping them, making them a reasonable starting point for a freedom-to-operate check ahead of new filings.
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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.