Grid-Forming Inverter for Marine Power Patent Landscape
Grid-Forming Inverter for Marine Power Patent Landscape in 2026
The patent corpus for grid-forming inverters applied to marine power is extremely nascent, with only 2 patent families on record and the University of Kiel holding all of them. The field is essentially uncontested, presenting a wide-open R&D entry window for industrial and maritime power-electronics developers.
University of Kiel holds the entire landscape — zero industrial competition recorded
The University of Kiel is the sole ranked applicant, holding all 2 patent families currently identified in this space. No industrial or commercial entity appears in the applicant ranking.
Concentration is absolute: the top five filers’ share of the hundred largest filers is 100%, and in this case that entire share belongs to a single academic institution. There is no meaningful tier structure — the field has not yet attracted the multi-applicant competition typical of maturing domains.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | University of Kiel | 2 |
The University of Kiel’s position signals that foundational, academically driven invention characterizes the current state of the art. For industrial entrants, there are no established corporate incumbents to navigate around, but the existing academic IP should be assessed for licensing or freedom-to-operate implications before filing.
The most recent data years carry inherent publication lag of 18–24 months; the apparent absence of filings after 2018 likely underestimates actual recent activity and should not be read as stagnation. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity concentrated in a single filing year; technology mix centres on power conversion and protection
The annual filing trend and technology composition together reveal an early-stage, single-event corpus — two families filed in 2018 and nothing recorded before or since in this specific intersection. The technology branches confirm a focus on core inverter control and protective circuitry rather than system-level marine integration.
Annual filing trend
All 2 patent families were filed in 2018, with no activity recorded in any other year from 2017 to 2026. The post-2018 zero counts are consistent with both genuine inactivity and the 18–24-month publication lag that typically suppresses the most recent years’ apparent totals; conclusions about long-term trend cannot be drawn from this volume.
↗ Hover for values · click a bar to ask EurekaTechnology composition
Both families are classified under H02H (protective circuit arrangements) and H02M (power conversion, AC/DC etc.), indicating that the inventive focus is on inverter control and fault-protection logic. Marine-specific system integration — propulsion interfaces, shipboard distribution, islanding for vessel microgrids — is absent from the IPC classification, pointing to significant adjacent white space.
↗ 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.
VERFAHREN ZUR STEUERUNG EINES NETZBILDENDEN UMRICH…
| # | Patent | Citations |
|---|---|---|
| 1 | Method for controlling a grid-forming converter, c… | 1 |
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 structure means for R&D investment decisions
With only 2 patent families and a single academic filer, this landscape offers a rare greenfield signal: foundational concepts exist but commercial development is essentially absent. The insights below translate the structural observations into actionable R&D guidance.
Pre-commercial, embryonic stage
The lifecycle stage cannot be formally classified from the available evidence given the corpus size of 2 patent families. The single filing cohort in 2018 and the academic-only applicant profile are consistent with a pre-commercial, embryonic phase where basic control concepts have been explored but industrial scaling has not begun. Entrants would be working at the frontier rather than against an established prior-art wall.
EmbryonicSingle-applicant dominance with no industrial tier
The University of Kiel accounts for 100% of the ranked corpus. There is no second-tier challenger, no corporate incumbent, and no observable competitive dynamic. This makes the space unusually accessible for a first industrial mover, though freedom-to-operate analysis against the existing Kiel families (EP3591820B1 and DE602018022684T2) is a prerequisite before filing.
GreenfieldNo co-applicant activity detected
Evidence of co-filing or inter-institutional collaboration is absent from the corpus. No joint assignees, consortium filings, or cross-sector partnerships are recorded. This reinforces the embryonic character of the field and suggests that pre-competitive consortia — for example, pairing a maritime OEM with a power-electronics research group — could be a structurally differentiating strategy.
No co-filersCoverage limited to Germany and the EPO
Jurisdictional coverage is narrow: Germany holds 1 patent record and the European Patent Office holds 1, with no filings identified in the United States, China, Japan, South Korea, or key maritime-nation offices such as Norway or South Korea. For any entrant targeting global shipbuilding markets or offshore energy, there is broad geographic freedom to file and build jurisdiction-specific portfolios.
Geographic white spaceGo 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.
Co-filing pairs, ranked by the number of jointly-filed patent families.
University of Kiel: sole inventor in a commercially unoccupied space
The applicant ranking contains only one entity. No momentum data or multi-applicant comparison is available from the evidence; the characterisation below is based on family count, technology focus, and representative patent records.
University of Kiel
The University of Kiel holds all 2 patent families in scope, with technology emphasis on H02H protective circuit arrangements and H02M power conversion — specifically subclasses H02H3, H02H7, and H02M1. Representative patents EP3591820B1 and DE602018022684T2 define the current prior-art boundary. No applicant momentum trend data is available from the evidence, so trajectory beyond the 2018 filing cohort cannot be characterised.
families: 2No challenger identified
No second-ranked applicant exists in the evidence. The challenger tier is entirely vacant, which is itself the most important competitive signal in this landscape: any industrial or research entity filing in this space would immediately become the second-largest rights-holder globally.
families: 0Under-served adjacent branches worth monitoring
The whitespace array returned no pre-computed candidates, so the observations below are derived from the IPC gaps visible in the technology composition data. These are observations of relative sparsity, not validated commercial opportunities.
Shipboard microgrid islanding and black-start control
The corpus covers inverter-level protection (H02H) and conversion (H02M) but contains no filings addressing vessel-level microgrid islanding, black-start sequencing, or dynamic positioning power management — functions critical to naval and offshore applications. The sparsity is plausible as an under-served area given the technical necessity of these functions in marine power architecture. An entry path would combine the existing Kiel control methods with maritime IEC/IEEE standards for shipboard electrical systems.
Search this in Eureka →Propulsion-integrated power electronics for electric and hybrid vessels
Neither H02K (rotating machinery) nor B63H (ship propulsion) appears in the recorded IPC classes, indicating that the interface between grid-forming inverter control and variable-speed propulsion drives is unaddressed in this corpus. Hybrid and fully electric vessel propulsion is a growing area in naval and commercial shipping, giving plausible technical value to this gap. A realistic entry path would involve co-development with a propulsion OEM and joint filing targeting both maritime and industrial power-electronics classifications.
Search this in Eureka →How applicants differ by technology route
Strength of each leader across the main technology routes.
| Player | H02H 3 · Protective circuit arrangements | H02H 7 · Protective circuit arrangements | H02M 1 · Power conversion (AC/DC etc.) |
|---|---|---|---|
| University of Kiel | Strong · 2 | Strong · 2 | Strong · 2 |
Frequently asked questions
The evidence identifies 2 patent families in scope. This is an extremely small corpus, signalling that the intersection of grid-forming inverter technology with marine power applications is at a very early stage of patenting activity.
The University of Kiel is the only ranked applicant and holds all 2 patent families. No industrial or commercial entity appears in the current applicant ranking. Representative patent numbers are EP3591820B1 and DE602018022684T2.
Coverage is limited to Germany (1 patent record) and the European Patent Office (1 patent record). Major maritime markets including the United States, China, Japan, Norway, and South Korea show no filings in the evidence, leaving broad geographic freedom to file.
Both families are classified under H02H (protective circuit arrangements) and H02M (power conversion, including AC/DC conversion). Specifically, the University of Kiel’s portfolio touches subclasses H02H3, H02H7, and H02M1. Marine-specific system-level integration is not represented in the IPC classification.
No co-applicant or inter-institutional collaboration is recorded in the evidence. All filing activity originates from the University of Kiel acting alone, leaving the co-development space entirely open.
Based on IPC gaps in the current corpus, two under-served adjacent areas stand out: shipboard microgrid islanding and black-start control (absent from the classified branches), and propulsion-integrated power electronics for electric and hybrid vessels (no H02K or B63H classification present). These are observations of sparsity rather than validated opportunities, and technical feasibility and freedom-to-operate should be assessed before committing resources.
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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.