Satellite Electric Propulsion Patents: Leaders & White Space 2026
- Filing already peaked. 2018 recorded 18 filings, the high point in the dataset; by the 2022 midpoint annual filing had fallen back to 4, and the trend has stayed flat since.
- F03H dominates the IPC mix. 109 of 121 families sit in plasma and ion propulsion (F03H), with spacecraft-systems overlap (B64G, 41) far more common than power-grid or UAV crossover.
- Filing is split across five offices with no single gatekeeper. United States (30) and China (27) lead, but Europe, WIPO/PCT, Israel and India each carry a meaningful share, so freedom-to-operate has to be checked jurisdiction by jurisdiction.
What the filing record shows
Patent activity in satellite electric propulsion concentrates around Hall-effect and gridded ion thruster architectures, with F03H (plasma and ion propulsion) accounting for the large majority of the 121 families in this dataset. Filing rose through the mid-2010s, peaked in 2018, and has since declined toward a flatter baseline — a pattern consistent with an early wave of core-architecture claims followed by a period of incremental refinement rather than new platform invention.
Because publication lags filing by roughly 18 months, the most recent years in this trend understate actual filing activity; 2025 and 2026 figures will revise upward as later-filed applications publish. The receiving-office spread — five offices each with a double-digit or near-double-digit share — points to a field where protection is pursued multi-jurisdictionally rather than concentrated behind a single national filter.
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Filing trend and technology composition
Two views of the same 121-family dataset: how filing volume has moved year over year, and how those families distribute across the IPC subclasses that define the technology.
A 2018 peak followed by a decline to a flat baseline
Annual filings rose from 4 in 2017 to a peak of 18 in 2018, then eased back; by the 2022 midpoint, annual filing had returned to 4, and the trend since has been flat to declining rather than resuming growth.
Ion and plasma propulsion dominates the IPC mix
F03H (plasma and ion propulsion) covers 109 of 121 records, with B64G (cosmonautics and spacecraft) appearing in 41 — largely as system-integration overlap. H05H, F02K, H01J, B64U, H02J and A61L each appear in single digits, marking them as adjacent rather than core to this claim space.
Shares are the percentage of the 121 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Satellite Electric Propulsion Technology Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about satellite electric propulsion technology landscape and every answer comes back with the patent numbers behind it.
Try EurekaThe records other filings cite most
Deployable gridded ion thruster (US20190195206A1)
The application describes a gridded ion thruster with an expandable discharge chamber that compresses into the thruster body for storage and expands outward once deployed, alongside methods of operating the thruster through that transition.Filed by Georgia Tech Research Corporation; published 2019-06-27.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6637701B1 | Gimbaled ion thruster arrangement for high efficiency stationkeeping | 71 |
| 2 | US20020194833A1 | Linear gridless ion thruster | 43 |
| 3 | US7827779B1 | Liquid metal ion thruster array | 31 |
| 4 | CN106351811A | 一种低功率、磁场可调的圆柱型电磁等离子体推进器 | 28 |
| 5 | US4466242A | Ring-cusp ion thruster with shell anode | 27 |
| 6 | US20050178919A1 | System and method for an ambient atmosphere ion thruster | 25 |
| 7 | US8468794B1 | Electric propulsion apparatus | 22 |
| 8 | CN105003408A | 一种离子与霍尔混合型电推力器 | 20 |
| 9 | US6640535B2 | Linear gridless ion thruster | 19 |
| 10 | US20200256325A1 | Ignition process for narrow channel hall thruster | 18 |
Citation counts are drawn from within this searched corpus and favour older records that have had more time to accumulate citations; treat them as a measure of influence on subsequent filings, not of current commercial relevance.
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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The filing trend and IPC composition together describe a technology that had its architecture-defining wave several years ago and is now being refined rather than reinvented.
The core-architecture wave has passed
Filing peaked in 2018 and had roughly quartered by 2022, with no resurgence visible through the rest of the window. New entrants are more likely to be filing around existing thruster architectures than proposing new ones.
Claim density sits almost entirely in F03H
Ninety percent of records fall inside plasma and ion propulsion. Spacecraft-systems overlap (B64G) is common, but crossover into power supply (H02J) or UAV platforms (B64U) is rare, suggesting the technology is claimed as a propulsion unit rather than a system-level power architecture.
No single office gatekeeps the field
United States and China lead but neither dominates outright; EPO, WIPO/PCT, Israel and India each hold a meaningful slice. Freedom-to-operate work has to be run per jurisdiction rather than assumed from a single leading office.
Influence concentrates in a handful of early filings
The most-cited records date to earlier in the window and describe foundational gimbaled and gridless ion thruster arrangements. Newer filings have not yet accumulated comparable citation counts, which is a function of corpus age as much as technical importance.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to satellite electric propulsion technology landscape, with the prior art for and against each one.
Assignees and where their filing has slowed
Momentum data shows the named assignees below all recorded zero filings in the latest year of the dataset — consistent with the broader post-2018 slowdown rather than any single company's retreat.
A dense academic-industrial pairing in France
The CNRS and Institut Polytechnique de Paris (Ecole Polytechnique) pairing accounts for 19 shared families, by far the strongest co-assignee link in the dataset and far ahead of the next pairings, which each show 2 shared families around University of Michigan inventors.
Leading assignees have gone quiet in the latest year
CNRS, Institut Polytechnique de Paris, ENPULSION, Safran Aircraft Engines, RAFAEL (technology research and development fund), and Beihang University all show zero filings in the most recent year — a pattern that tracks the overall filing decline rather than isolated company-level pullback.
A moderately fragmented assignee base
With 121 families spread across a ranking that includes university, national-lab and corporate assignees, no single entity appears to hold a dominant share, leaving room for new filers to stake claims in specific thruster subsystems.
| Assignee | Recent year | YoY |
|---|---|---|
| Centre National de la Recherche Scientifique (CNRS) | 0 | — |
| Institut Polytechnique de Paris (Ecole Polytechnique) | 0 | — |
| ENPULSION | 0 | — |
| Safran Aircraft Engines | 0 | — |
| RAFAEL – Technology Research and Development Fund Ltd. | 0 | — |
| Beihang University | 0 | — |
| The Regents of the University of Michigan | 0 | — |
| UNDEFINED TECHNOLOGIES CORP | 0 | — |
Where to take this analysis
The filing and citation data point to specific next steps depending on whether the goal is freedom-to-operate, licensing, or new filing strategy.
Check freedom-to-operate per office
With filing spread across US, China, EPO, PCT, Israel and India rather than concentrated in one office, a clearance search needs to run separately in each jurisdiction relevant to a planned launch or sale.
Run a clearance search in EurekaMap the under-claimed branches
Thrust vectoring, power-grid integration and miniaturised platforms show far fewer records than the core F03H cluster — worth a deeper look before assuming the space is occupied.
Explore white space in EurekaTrack the France-centred co-filing cluster
The CNRS and Institut Polytechnique de Paris pairing is the densest collaboration in the dataset; understanding what it covers helps calibrate any European filing or licensing approach.
View assignee networks in EurekaCommon questions about satellite electric propulsion patents
The assignee ranking in this dataset of 121 patent families is moderately fragmented, spanning universities, national research bodies and aerospace corporations rather than being dominated by a single company. The strongest identifiable collaboration is between CNRS and Institut Polytechnique de Paris, which co-file as a pair on 19 shared families, the densest link in the dataset. Beyond that pairing, filing is distributed enough that no single entity holds an outright majority, so a full assignee ranking is more useful than naming any one 'leader.'
Filing peaked in 2018 at 18 records and had fallen back to 4 by the 2022 midpoint, with the trend staying flat to declining since. That is a slowdown from an earlier filing wave rather than a sign the technology is being abandoned; it more likely reflects that core thruster architectures were claimed earlier in the window and recent work is incremental. Readers should also account for publication lag, which understates filings in the last one to two years shown in any trend.
Both fall under F03H, the plasma and ion propulsion subclass that covers 109 of the 121 records in this dataset, but they represent distinct thruster architectures with separate claim histories. Gridded ion thrusters, exemplified by records like the deployable gridded ion thruster from Georgia Tech Research Corporation, tend to center on grid geometry, discharge chamber design and beam extraction. Hall-effect approaches center on magnetic field shaping and channel geometry instead. A freedom-to-operate review should treat these as separate claim families rather than a single technology bucket.
The United States leads with 30 filings in this dataset, followed closely by China at 27, then the European Patent Office at 15, WIPO/PCT filings at 13, Israel at 8 and India at 6. This spread across six offices means that no single jurisdiction acts as a gatekeeper for the technology, and companies planning to launch or sell propulsion hardware need to run clearance checks in each relevant market rather than relying on a US or China-only search.
Relative to the dense F03H core, several adjacent branches carry only single-digit record counts: thrust vectoring control specific to gridded ion thrusters, power-grid integration for electric propulsion systems (H02J overlap), and miniaturised thrusters for small-UAV platforms (B64U overlap, just 5 records). These lower counts do not guarantee an easy grant, but they indicate claim space that has not been heavily staked out compared to core discharge-chamber and thruster-body architecture, which is worth deeper diligence before assuming freedom to file.
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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.