Electric Aircraft Propulsion Patents: Leaders, Trends & White Space 2026
- Filing peaked in 2020 at 15 records, then went flat. The midpoint year (2022) had just 1 filing, meaning the field cooled well before this dataset's cut-off rather than building steadily toward it.
- B64D aircraft-equipment claims cover all 43 families. Every record in this corpus touches aircraft-equipment classification, while only 6 reach into H02P motor-control specifics — a gap between airframe-level and drive-level claim depth.
- The most-cited records are system-level, not component-level. Citation leaders describe regional air-transit network architectures and whole hybrid-electric powertrains, not motor or inverter durability mechanisms specifically.
What this landscape covers
This landscape tracks patent families addressing motor reliability, inverter durability, fault tolerance and certification durability within electric and hybrid-electric aircraft propulsion. The search combines aircraft-propulsion terminology with reliability-specific claim language, filtered to IPC classes covering aircraft electrical equipment (B64D27/24), electric motors and generators (H02K11) and motor control (H02P29). The result is a narrow, durability-focused slice of the broader electric-aviation field rather than propulsion architecture as a whole.
Coverage runs from 2015 through the 2026-07-31 data cut-off, with 43 published families across a small set of receiving offices concentrated in the United States. Because publication trails filing by roughly 18 months, the most recent year in the trend is understated and should not be read as a genuine drop-off on its own.
Filing trend and technology composition
Two views of the same 43 families: when they were filed, and which IPC subclasses their claims sit in.
Filing trend, 2017–2026
Filings rose to a peak of 15 in 2020, then dropped sharply; by the midpoint year 2022 there was only 1 filing, and the trend has stayed flat or declining since — a pattern consistent with a technology area that had a filing burst around early hybrid-electric aircraft programmes rather than sustained, broadening investment.
IPC subclass composition
B64D (aircraft equipment) appears in all 43 families, and B64C (aeroplanes and helicopters) in 27 — confirming this is an airframe-and-systems-level corpus. Electric-motor classifications (H02K, 18 records) and motor-control classifications (H02P, 6 records) are present but thinner, and traffic-control (G08G, 12) and navigation (G01C, 9) classes appear alongside propulsion claims, suggesting many families bundle propulsion reliability with fleet-operations or airspace-management claims rather than isolating the motor or inverter hardware.
Shares are the percentage of the 43 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Electric Aircraft Propulsion Reliability and Durability with Eureka
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Try EurekaThe most-cited and most representative filings
US11465763B2 — Hybrid-electric aircraft, and methods, apparatus and systems for facilitating same
Hybrid-electric aircraft and a series hybrid powertrain configured to power the aircraft for a medium-haul flight. The series hybrid power train includes a plurality of energy storage units, at least one range extending generator, and a plurality of electric propulsors, each coupled to a distribution bus. The electric propulsors can produce a maximum thrust of at least 15 MW. During a cruise regime, the hybrid-electric aircraft can have an airspeed of at least 0.7 Mach at an altitude of less than 32000 feet, and the plurality of electric propulsors can have a fan pressure ratio of between 1.15 and 1.19.Filed by Zunum Aero; 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 | US20210107664A1 | Electric aircraft propulsion system | 44 |
| 6 | WO2020227837A1 | Electric aircraft propulsion system | 37 |
| 7 | US10501194B2 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 36 |
| 8 | US20200346769A1 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 35 |
| 9 | US20220009644A1 | Electric aircraft propulsion system | 28 |
| 10 | EP3657468A1 | System and methods for implementing regional air transit network using hybrid-electric aircraft | 18 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are not a measure of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the filing trend, citation pattern and IPC spread.
A filing burst, not a build-up
Activity peaked in 2020 and then collapsed to a single filing by the 2022 midpoint. That shape points to a cluster of early hybrid-electric aircraft programmes filing defensively around the same period, rather than a technology attracting steadily increasing investment.
Airframe claims dominate; motor-control claims are thin
Every family in the corpus touches aircraft-equipment classification (B64D), but only 6 reach into motor-control specifics (H02P). Reliability and durability claims here are mostly framed at the aircraft-system level, with the electric-drive control layer comparatively under-claimed.
Influence concentrates in system architecture, not components
The most-cited records describe regional air-transit network concepts and whole hybrid-electric powertrains. Component-level reliability mechanisms — motor bearings, inverter thermal cycling, fault-tolerant windings — do not appear among the highest-cited filings, suggesting citation weight sits with the earliest architecture disclosures.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electric aircraft propulsion reliability and durability, with the prior art for and against each one.
Who is filing, and where the field is open
Recent-year momentum across named assignees is flat to negative, with the tracked leaders each showing zero filings in the latest year and one showing a full year-over-year drop. That is consistent with the broader trend: this is a corpus with an early filing peak and little recent renewal from its historical leaders.
US-centred filing, thin elsewhere
The United States receives 21 of the 43 families, with Europe (7), Israel (6), Canada (3), Australia (2) and India (2) making up the remainder. Durability and reliability claims in this space have not yet spread broadly across multiple certification jurisdictions.
Historical leaders have gone quiet
Every tracked assignee in the recent-momentum data shows zero filings in the latest year, including a -100% year-over-year drop for one filer. Whoever files next into durability-specific claims is filing into a corpus with little active defence from the original leaders.
Reliability claims sit at the intersection of several fields
Families here cross aircraft equipment, motor hardware, motor control, navigation and even fluid-handling classifications (F04D, 4 records). That breadth signals reliability and durability claims are frequently attached to broader system patents rather than filed as standalone durability disclosures.
| Assignee | Recent year | YoY |
|---|---|---|
| Dassault Aviation | 0 | — |
| ZUNUM AERO INC | 0 | -100% |
| Rolls-Royce plc | 0 | — |
| Rolls-Royce Deutschland Ltd & Co KG | 0 | — |
Where to take this analysis
The published-family view above is a starting point. Two directions extend it usefully.
Pressure-test the white space
Run a freedom-to-operate check against the specific under-claimed branches — inverter thermal cycling, fault-tolerant windings — before committing engineering time to them.
Explore white space in EurekaTrack the quiet leaders
The tracked assignees show zero recent filings; monitor whether that reflects programme wind-down or a pause ahead of a fresh filing wave tied to certification milestones.
Set up assignee monitoring in EurekaCommon questions on this landscape
This dataset identifies 43 published patent families matching reliability- and durability-specific claim language within electric and hybrid-electric aircraft propulsion, filtered to aircraft-electrical, motor and motor-control IPC classes. That is a narrow slice of the broader electric-aviation patent space, since it excludes general propulsion-architecture filings that do not address reliability, fault tolerance or certification durability directly. The true figure for durability-adjacent filings not captured by this exact search string is likely higher.
The tracked assignees in the recent-momentum data all show zero filings in the latest year, including at least one with a full year-over-year drop to zero. Citation leadership sits with early system-level hybrid-electric aircraft filings rather than component-durability specialists. This suggests the field does not yet have an active, renewing leader at the durability-claim level, which leaves room for a new entrant to establish a strong position with focused filings.
The trend shows a peak of 15 filings in 2020 followed by a drop to just 1 filing by the 2022 midpoint, with the pattern staying flat or declining since. This is typical of a burst tied to a specific wave of hybrid-electric aircraft programme announcements rather than sustained platform investment. Readers should also account for publication lag of roughly 18 months, which understates the most recent year or two in any such trend.
US11465763B2, assigned to Zunum Aero, claims a hybrid-electric aircraft with a series hybrid powertrain: energy storage units, a range-extending generator and multiple electric propulsors on a shared distribution bus, specified with numeric limits including at least 15 MW maximum thrust, cruise airspeed of at least 0.7 Mach below 32,000 feet, and propulsor fan pressure ratios between 1.15 and 1.19. It is a system-architecture claim rather than a component-durability claim, so it constrains aircraft-level powertrain configuration more than it does specific motor or inverter reliability mechanisms.
The clearest gap sits between airframe-level claims, which appear in all 43 families via B64D classification, and drive-level claims, which appear in only 6 families under H02P motor-control classification. Specific mechanisms — inverter thermal-cycling fault detection, fault-tolerant winding topologies, bearing degradation monitoring, and certification-durability test protocols for distributed propulsor arrays — show low filing density relative to the breadth of system-level architecture patents above them. That gap is where a narrowly drafted, mechanism-specific claim is least likely to run into dense prior art.
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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.