Hybrid-Electric Aircraft Reliability Patents: Leaders & Gaps 2026
- A small, concentrated field. 18 families total, with filing activity that peaked in 2019 at 5 and has not returned to that level since.
- One filer dominates the citation record. The most-cited records in this set, led by a 392-citation filing, trace back to a single regional air transit concept rather than a broad field of competing designs.
- Filed almost entirely through one office. 15 of the 18 records entered via the United States, with only single filings reaching Canada, Europe and India.
Filing growth compares 2021 (2 records) with 2024 (0) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field.
A narrow, US-centred claim set built around one propulsion concept
Hybrid-electric aircraft reliability and durability is a small patent set: 18 published families since 2015, concentrated on propulsion reliability, motor durability, fault tolerance and certification durability claim language layered onto hybrid-electric and turbo-electric propulsion architectures. Filing activity rose to a peak of 5 families in 2019 and has since flattened, with the 2022 midpoint sitting at just 1 family filed. That trajectory suggests the field has not yet moved from concept filings into a second wave of derivative or defensive claims.
The technology composition leans heavily on aircraft-equipment and airframe classes rather than motor or power-electronics classes: B64D and B64C dominate, with traffic-control (G08G) and navigation (G01C) classes appearing almost as often. Electric-motor-specific classification (H02K) and motor-control classification (H02P) barely register, which is notable given the topic name explicitly targets motor durability and fault tolerance.
Filing trend and technology composition
Publication in patent data lags filing by roughly 18 months, so the most recent year on this chart is always the most understated. Read the composition chart alongside the trend: a class can carry many records without carrying most of the reliability-specific claim language.
A single peak year, then a plateau
Filings ran to zero in 2017, rose to a peak of 5 in 2019, and by the 2022 midpoint had fallen back to 1. There is no second filing wave visible in this window, and the 2026 figure is necessarily incomplete given publication lag.
Airframe and traffic-control classes outweigh motor-specific ones
B64D (aircraft equipment) covers all 18 records and B64C (aeroplanes and helicopters) covers 14, while G08G (traffic control) and G01C (navigation) each appear in a majority of records too. H02K (electric motors and generators) and the plasma/ion propulsion class F03H each appear only once, meaning the durability and fault-tolerance claims in this set are argued mostly at the aircraft-system level, not at the motor-component level.
Shares are the percentage of the 18 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 citation record is dominated by one lineage of filings
Hybrid-electric aircraft, and methods, apparatus and systems for facilitating same (US11465763B2)
Describes a series hybrid powertrain for a medium-haul hybrid-electric aircraft: multiple energy storage units, at least one range-extending generator, and multiple electric propulsors on a shared distribution bus. Claimed operating parameters include propulsor thrust of at least 15 MW, cruise airspeed of at least 0.7 Mach below 32,000 feet, a fan pressure ratio between 1.15 and 1.19, and a degree of hybridization of at least 25%.Assignee: Zunum Aero, Inc. · Granted 2022-10-11
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20160236790A1 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 392 |
| 2 | US20200290742A1 | Hybrid-electric aircraft, and methods, apparatus and systems for facilitating same | 249 |
| 3 | US20180134400A1 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 87 |
| 4 | US9561860B2 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 69 |
| 5 | US10501194B2 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 36 |
| 6 | US20200346769A1 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 35 |
| 7 | EP3657468A1 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 18 |
| 8 | US11104444B2 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 16 |
| 9 | CA2996844A1 | Power train for a hybrid-electric aircraft | 15 |
| 10 | US20220219827A1 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 10 |
Citation counts inside a searched corpus favour older filings; treat rank here as a signal of influence on later filers, not of current technical importance.
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Browse MCP servers →What the numbers say about where this field actually sits
With only 18 families in the set, every figure below should be read as a description of a narrow, early-stage claim space rather than a mature industry.
One filing wave, not a sustained trend
The dataset shows a single peak in 2019 and a flat-to-declining pattern afterward, with the 2022 midpoint at just 1 filing. That is consistent with a small number of applicants staking out a concept early and few others following.
Protection is concentrated in one jurisdiction
The overwhelming majority of records entered through the United States receiving office. Single filings in Canada, Europe and India suggest applicants have not yet pursued broad multi-jurisdiction coverage for this claim language.
Influence sits with one lineage of filings
The most-cited record carries 392 citations, more than the next two most-cited records combined. Several of the top-cited titles share nearly identical wording, pointing to a family of related filings from one applicant line rather than independently arrived-at designs.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hybrid-electric aircraft reliability and durability, with the prior art for and against each one.
A short applicant list with limited recent momentum
The assignee set behind these 18 families is small, and the momentum data shows recent activity fading rather than building. None of the tracked assignees show positive year-over-year movement in the latest period.
Zunum Aero's filing activity has stopped
Zunum Aero, the assignee behind the most-cited and the representative record in this set, shows zero filings in the latest tracked year against a -100% year-over-year change. Its earlier filings remain the anchor of the citation table.
Rolls-Royce Germany holds a static position
Rolls-Royce's German entity appears in the assignee set with no filings in the latest tracked year, indicating a holding rather than an expanding position in this specific reliability and durability claim space.
Academic filer activity has also gone quiet
NIMS University Rajasthan Jaipur shows the same pattern as the commercial filers: zero filings in the latest year and a -100% year-over-year drop, suggesting the academic contribution to this set was a one-off rather than a sustained programme.
| Assignee | Recent year | YoY |
|---|---|---|
| ZUNUM AERO INC | 0 | -100% |
| Rolls-Royce Deutschland Ltd & Co KG | 0 | — |
| NIMS UNIV RAJASTHAN JAIPUR | 0 | -100% |
Where to take this analysis
The filing pattern here points to a narrow, early-stage claim space still argued mostly at the aircraft-system level rather than the motor-component level.
Map the motor-durability gap directly
H02K and H02P classes are almost absent from this set despite the topic's focus on motor durability and fault tolerance. Run a focused search on those classes alone to see whether the gap is real or an artefact of this query's scope.
Explore in EurekaTrack the Zunum Aero lineage forward
The most-cited records share near-identical titles and one applicant line. Pull forward and backward citations on that lineage to see who has built on it and whether any recent filer has designed around it.
Explore in EurekaCommon questions about this landscape
This landscape identifies 18 published patent families matching propulsion reliability, motor durability, fault tolerance and certification durability claim language within hybrid-electric and turbo-electric aircraft filings, covering 2015 through the 2026 data cut-off. That is a small set by aerospace patent standards, and it reflects a fairly narrow search scope rather than the full body of hybrid-electric aircraft patents generally. Because publication lags filing by around 18 months, the most recent year's count is understated and will rise as later-filed applications publish.
Zunum Aero holds the most-cited and most prominent filings in this set, including the representative record on a series hybrid powertrain for medium-haul flight. Rolls-Royce's German entity and an academic filer, NIMS University Rajasthan Jaipur, also appear in the assignee list, but recent-year momentum data shows none of the tracked assignees filing in the latest year. The overall applicant base is short, which is typical for a technology area still in its early claim-staking phase.
The data shows filings peaking at 5 in 2019, dropping toward a midpoint of 1 filing in 2022, and staying flat rather than climbing toward the present. This pattern usually means an early wave of applicants staked out core concepts and few competitors have since filed directly in this narrow claim space. It does not necessarily mean interest in hybrid-electric aircraft reliability is fading industry-wide, since related filings may sit in adjacent classifications not captured by this search.
US11465763B2, assigned to Zunum Aero, claims a hybrid-electric aircraft with a series hybrid powertrain: multiple energy storage units, at least one range-extending generator, and multiple electric propulsors on a shared distribution bus. Its claimed operating envelope includes propulsor thrust of at least 15 MW, cruise airspeed of at least 0.7 Mach below 32,000 feet, a fan pressure ratio between 1.15 and 1.19, and a degree of hybridization of at least 25%. Anyone designing a series-hybrid, distribution-bus architecture in that speed and altitude envelope should review this claim set closely before finalising an architecture.
The technology composition skews heavily toward aircraft-equipment and airframe classifications (B64D, B64C) and traffic-control or navigation classes (G08G, G01C), while electric-motor classification (H02K) and motor-control classification (H02P) each appear in only a single record. That gap suggests motor-level fault detection, inverter redundancy switching, distribution-bus fault isolation and generator health prognostics are all under-claimed relative to the system-level framing that dominates the current filings. A first claim in any of those branches would likely face less direct prior art than one framed at the whole-aircraft level.
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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.
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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.