HVDC Transmission for Electric Aircraft Patent Landscape
HVDC Transmission for Electric Aircraft Patent Landscape in 2026
The HVDC transmission for electric aircraft patent space is tightly concentrated, with Hamilton Sundstrand Corp holding a commanding lead and the top five filers accounting for two-thirds of activity among the hundred largest filers. Annual volume peaked in 2022 and has since eased, placing the field in a post-peak phase where foundational power-supply and conversion IP is well-staked but adjacent hardware branches remain sparsely covered.
Hamilton Sundstrand leads a tightly held, specialist field
Hamilton Sundstrand Corp holds the top position in this corpus with 17 patent records — more than twice the combined total of the next two ranked filers — establishing a clear first-tier advantage in HVDC power architecture for electric aircraft.
The top five filers account for 67% of the activity recorded among the hundred largest filers, a concentration level that signals a small, specialist community rather than a broad-based technology race. Rolls-Royce entities (North American Technologies, Corp, and Singapore) collectively form a coherent second tier, while Nanjing University of Aeronautics and Astronautics represents the leading academic presence at four patent records.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Hamilton Sundstrand Corporation | 17 | |
| 2 | Rolls-Royce North American Technologies Inc | 6 | |
| 3 | NANJING UNIV OF AERONAUTICS & ASTRONAUTICS | 4 | |
| 4 | Rolls-Royce Corp | 2 | |
| 5 | Rolls-Royce Singapore Pte Ltd | 2 | |
| 6 | GE Infrastructure Technology LLC | 2 | |
| 7 | Safran Helicopter Engines | 1 | |
| 8 | French National Centre for Scientific Research (CNRS) | 1 | |
| 9 | MR PATHKOTA SAI NIRANJAN KUMAR | 1 | |
| 10 | MRS UJWALA GAJULA | 1 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | DR GUNDLAPALLI SATHEESH | 1 | |
| 12 | DR K SHYAMALA DEVI | 1 | |
| 13 | DR NOMULA MALLA REDDY | 1 | |
| 14 | MR M YASHWANTH KUMAR | 1 | |
| 15 | MRS SAGGURTHI BHULAKSHMI | 1 | |
| 16 | MS N HIRANMAI | 1 | |
| 17 | MR CHINTALAPUDI LEELA KRISHNA | 1 | |
| 18 | G NARAYANAMMA INST OF TECH & SCI FOR WOMEN | 1 | |
| 19 | University of Lorraine | 1 |
Hamilton Sundstrand’s scale advantage, combined with a focus on power supply and grid systems alongside power conversion, indicates deep foundational IP coverage that would require significant filing effort for any new entrant to match at the system level.
Figures for the most recent 18–24 months should be treated as provisional due to standard patent publication lag; apparent low activity in 2024–2025 reflects this delay rather than confirmed cessation of filing. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2022 filing peak followed by easing volume; power electronics dominate the technology mix
Two perspectives reveal the field’s current state: the annual filing trend shows a clear peak in 2022 followed by reduced activity, while the technology composition chart shows that power supply and conversion classes hold an outsized share relative to aircraft-specific hardware classes.
Annual filing trend
Filings were negligible in 2017, rose through 2018–2021, and peaked at ten records in 2022 before dropping to two records in each of 2023 and 2024. The 2023–2025 figures are subject to publication lag and should not be read as the definitive end of activity; the overall recent-window growth rate is negative at -18%, consistent with a post-peak phase.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H02J (power supply and grid systems) and H02M (power conversion) together dominate the IPC branch mix, reflecting that the bulk of HVDC aircraft work to date concerns the electrical architecture and converter design. H02H (protective circuit arrangements) is a notable third cluster. By contrast, B64D (aircraft equipment), H02K (electric motors and generators), and H02P (control of motors and generators) each appear in only a handful of records, indicating that aircraft-integration and machine-control dimensions of HVDC remain comparatively underdeveloped.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Parallel feeders for continued operation
A system includes four high voltage direct current (HVDC) feeders, each having a first contactor configured for selectively connecting a positive terminal of an HVDC source to the respective HVDC feeder, and having a second contactor configured for selectively connecting the respective HVDC feeder to an HVDC bus. A power converter can be configured to use… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Power converter protection circuit | 16 |
| 2 | Protection coordination technique for power conver… | 16 |
| 3 | Protection coordination technique for power conver… | 9 |
| 4 | 飞机分布式电网结构的单通道模块、发电系统及控制方法 | 6 |
| 5 | Power converter | 5 |
| 6 | A power supply system with first and second ac vol… | 3 |
| 7 | Mechanical and electrical connection of electric m… | 2 |
| 8 | Power converter protection circuit | 2 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
The combination of high concentration, a post-peak filing pace, nascent industry-academic collaboration, and a US-dominant jurisdiction profile shapes where incremental R&D investment is most and least defensible.
Post-peak: foundational architecture IP is established
The lifecycle stage is Decline, with annual filings easing back from the 2022 peak. Core power-supply and conversion claims are well-staked by the leading players. New entrants face a crowded foundational layer and would need to target differentiated sub-systems — fault protection, motor control, or physical interconnects — where filing density is lower.
Post-peak · 2022 peakTwo-tier structure with a dominant leader and a coherent Rolls-Royce cluster
Hamilton Sundstrand’s 17 patent records place it well ahead of any single rival. Rolls-Royce North American Technologies (6 records), Nanjing University of Aeronautics and Astronautics (4 records), and the two additional Rolls-Royce entities (2 records each) form a recognizable second tier. The top five filers hold 67% of activity among the hundred largest filers, leaving limited room for mid-tier challengers without a differentiated technical angle.
High concentrationIndustry-academic partnerships emerging around aircraft-specific power systems
The most active co-filing relationships identified are Rolls-Royce Corp with Rolls-Royce Singapore Pte Ltd (2 joint records), and a French consortium linking Safran Helicopter Engines, University of Lorraine, and CNRS (1 joint record each pairing). These collaborations suggest that aircraft-integration work (B64D) is being advanced partly through academic partnerships, while the leading US players have filed independently.
Consortium activityUS-led filing with European and emerging Chinese presence
The United States is the leading jurisdiction with 15 patent records, followed by Europe (EPO) with 8 and China with 5. Germany, Canada, India, and Austria each host a single record. The US dominance mirrors Hamilton Sundstrand’s lead position, while China’s five records — largely attributable to Nanjing University of Aeronautics and Astronautics — signal growing academic activity outside the established aerospace primes.
US · EPO · ChinaGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Rolls-Royce Corp | Rolls-Royce Singapore Pte Ltd | 2 |
| Safran Helicopter Engines | University of Lorraine | 1 |
| Safran Helicopter Engines | French National Centre for Scientific Research (CNRS) | 1 |
| University of Lorraine | French National Centre for Scientific Research (CNRS) | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Hamilton Sundstrand anchors power architecture; Rolls-Royce North American Technologies specialises in protection
The two principal commercial players diverge sharply in technical emphasis: Hamilton Sundstrand focuses on power supply grid systems and AC/DC conversion, while Rolls-Royce North American Technologies concentrates on protective circuit arrangements. Both appear as new entrants in the recent filing window, indicating that their activity is concentrated in the recent period relative to a near-zero prior baseline in this specific sub-field.
Hamilton Sundstrand Corp
Hamilton Sundstrand Corp leads with 17 patent records, built around H02J power supply and grid systems (8 records at the sub-class level) and H02M power conversion (5 and 3 records across sub-classes). The applicant momentum evidence marks the company as a new entrant in the recent window with 7 recent records, indicating that its dominant position was assembled quickly and is recent rather than legacy.
patent records: 17Rolls-Royce North American Technologies Inc
Rolls-Royce North American Technologies Inc holds 6 patent records with a distinctive focus on H02H protective circuit arrangements (6 records at sub-class level) and H02M power conversion (4 records), suggesting a strategy centred on fault protection and safe operation of HVDC systems aboard aircraft rather than primary power architecture. Its momentum also reflects a new-entrant pattern in the recent window.
patent records: 6| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Hamilton Sundstrand Corporation | 7 | ▲ new entrant |
| Nanjing University of Aeronautics and Astronautics | 2 | ▲ new entrant |
| GE Infrastructure Technology LLC | 2 | ▲ new entrant |
| Safran Helicopter Engines | 1 | ▲ new entrant |
| University of Lorraine | 1 | ▲ new entrant |
| French National Centre for Scientific Research (CNRS) | 1 | ▲ new entrant |
Under-served adjacent branches in aircraft integration and machine control
Several IPC branches adjacent to the dominant H02J/H02M core show sparse coverage in this corpus. These observations do not constitute validated commercial opportunities, but they identify areas where the patent landscape is thin relative to the technical requirements of a fully integrated HVDC electric aircraft.
B64D · Aircraft equipment integration
Only 3 patent records fall under B64D (aircraft equipment), representing a 5% share of records — sparse given that HVDC adoption ultimately requires aircraft-level integration of buses, distribution panels, and weight-optimised wiring harnesses. Safran Helicopter Engines, University of Lorraine, and CNRS are the only filers with B64D coverage, all via a single collaborative filing. An entrant with aircraft-systems integration capability and access to airworthiness data could pursue differentiated claims in this branch, particularly around airframe-level HVDC bus topology.
Search this in Eureka →H02P · Control of motors and generators
H02P (control of motors and generators) covers only 2 patent records — a 3% share — despite motor-drive control being a critical enabler for high-efficiency electric propulsion. The absence of substantial H02P coverage alongside the dominant H02J/H02M filings suggests that real-time torque and speed control strategies optimised for HVDC-fed aircraft motors have not yet been extensively claimed. This branch has plausible technical value for any player developing tightly integrated propulsion drives, and the low filing density may allow differentiated claims.
Search this in Eureka →How leading filers differ across HVDC technology routes
Strength of each leader across the main technology routes.
| Player | H02J 7 · Power supply & grid systems | H02M 7 · Power conversion (AC/DC etc.) | H02H 7 · Protective circuit arrangements | H02M 1 · Power conversion (AC/DC etc.) | H02J 1 · Power supply & grid systems |
|---|---|---|---|---|---|
| Hamilton Sundstrand Corporation | Strong · 8 | Strong · 5 | Emerging · 1 | Moderate · 3 | Moderate · 2 |
| Rolls-Royce North American Technologies Inc | Absent | Moderate · 2 | Strong · 6 | Strong · 4 | Absent |
| Nanjing University of Aeronautics and Astronautics | Strong · 4 | Absent | Absent | Absent | Strong · 4 |
| Rolls-Royce Singapore Pte Ltd | Absent | Strong · 2 | Strong · 2 | Absent | Absent |
| Rolls-Royce Corp | Absent | Strong · 2 | Strong · 2 | Absent | Absent |
| DR GUNDLAPALLI SATHEESH | Strong · 1 | Absent | Absent | Absent | Absent |
Frequently asked questions
The corpus in scope contains 33 patent families. This is a specialist, relatively small field compared with broader power electronics or electric vehicle domains, reflecting the early commercial stage of HVDC-powered electric aircraft.
Hamilton Sundstrand Corp leads with 17 patent records, more than double the 6 patent records held by the second-ranked filer, Rolls-Royce North American Technologies Inc. This gap represents a substantial first-mover advantage in foundational HVDC aircraft power architecture.
No. The lifecycle evidence places the field in a post-peak phase. Annual filings peaked at 10 records in 2022 and have eased since. The recent-window growth rate is -18%. Figures for 2023–2025 should be treated cautiously given standard patent publication lag, but the directional signal is one of declining annual volume from the 2022 high.
The United States is the leading jurisdiction with 15 patent records, followed by Europe (EPO) at 8 records and China at 5 records. Germany, Canada, India, and Austria each account for a single record. Any filing strategy should prioritise US and EPO coverage as the primary commercial arenas.
Yes, though limited. The most active co-filing relationship is between Rolls-Royce Corp and Rolls-Royce Singapore Pte Ltd (2 joint records). A French industry-academic consortium — Safran Helicopter Engines, University of Lorraine, and CNRS — accounts for 1 joint record per pairing. No broader multi-party consortia are evident in the evidence.
The sparsest adjacent branches are B64D (aircraft equipment, 3 records), H02P (control of motors and generators, 2 records), G05F (electric and magnetic variable control, 2 records), and H01R (connectors and current collectors, 2 records). These branches are thinly covered relative to the dominant H02J and H02M classes, and each has plausible technical relevance to full HVDC aircraft integration.
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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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