ICF Fuel Capsule Patents: Who Leads, Where the Gaps Are 2026
- G21B claims dominate the field. 141 of 188 records sit in fusion-reactor classification G21B, versus 42 in plasma/particle-accelerator H05H — the capsule and drive-geometry space is where filing density has concentrated.
- Filing peaked in 2018, then collapsed. Annual filings ran from 23 in 2017 to a peak of 32 in 2018, falling to just 1 filing at the 2022 midpoint before a small recent uptick — a land-grab-then-defend pattern, not steady growth.
- The most-cited patents are decades-old fabrication work. The top-cited records (117 and 111 citations) cover glass-microsphere and carbonized-foam capsule fabrication from well before the 2015 filing window, showing how much current work still builds on that base.
A narrow, capsule-centred slice of fusion patenting
This landscape covers 188 patent families filed between 2015 and mid-2026 that combine inertial confinement fusion, ICF or laser fusion terminology with deuterium-tritium target, fuel capsule or cryogenic fuel-layer language. It is deliberately narrow: broader fusion-reactor patenting is far larger, but this set isolates the claims that actually touch the fuel capsule and its target design, which is where laser- and beam-driven fusion approaches concentrate their intellectual property.
Filing activity rose through the late 2010s, peaked in 2018, and has since fallen back sharply, a pattern more consistent with an early claiming wave than with steady, ongoing expansion. Publication lags filing by roughly 18 months, so the final year or two in any trend chart will always look thinner than the true filing rate turns out to be once records catch up.
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Filing trends and technology composition
Publication counts by year and by IPC subclass show where inertial confinement fusion fuel-capsule filing activity has concentrated and how it has moved since the 2018 peak.
Filings rose sharply into 2018, then fell
Annual filings climbed from 23 in 2017 to a peak of 32 in 2018, then dropped to a low point at the 2022 midpoint before a small recent uptick. Because publication lags filing by roughly 18 months, the last one or two years understate true activity.
G21B fusion reactors dominate the classification mix
Of 188 records, 141 sit in G21B (fusion reactors) and 42 in H05H (plasma and particle accelerators). Everything else — optics, polymer processing, coatings, catalysis and lasers — trails well behind, each under 15 records.
Shares are the percentage of the 188 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Inertial Confinement Fusion Nuclear Fuel with Eureka
This page is one run against one query. Ask Eureka your own question about inertial confinement fusion nuclear fuel and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim in the capsule-geometry space
US20200327998A1 — Asymmetric capsule for inertial confinement fusion
Methods, devices and system for asymmetric inertial confinement fusion are disclosed. One method includes fixing in position a target capsule comprising an inertial confinement fusion fuel, where the target capsule is substantially spherical. The method further includes applying an oscillatory compression to the target capsule: compression at a first time in a radial direction orthogonal to a diametric axis, and compression at a second time along the diametric axis to drive the capsule into an ovoid shape. The oval-shaped target can implode upon being further driven at a third time.Filed by Lawrence Livermore National Security, LLC; published 2020-10-15.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4459145A | Fabrication of glass microspheres with conducting surfaces | 117 |
| 2 | US5047225A | Low density carbonized composite foams | 111 |
| 3 | US4992254A | Low density carbonized composite foams | 75 |
| 4 | US4735762A | Laser or charged-particle-beam fusion reactor with direct electric generation by magnetic flux compression | 66 |
| 5 | US20120014491A1 | Nuclear fusion power plant having a liquid reactor core of molten glass that is made laseractive and function… | 60 |
| 6 | US20110286563A1 | Control of a Laser Inertial Confinement Fusion-Fission Power Plant | 60 |
| 7 | US5116883A | Low density microcellular foams | 55 |
| 8 | WO2009058185A2 | Control of a laser inertial confinement fusion-fission power plant | 53 |
| 9 | WO2005001845A2 | Fusion apparatus and methods | 48 |
| 10 | US5232772A | Low density carbonized composite foams | 47 |
Ranked by citation count within the tracked corpus; older fabrication patents lead, reflecting foundational status rather than current filing volume.
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Three patterns stand out once the raw counts are read against each other: where claim density sits, how activity has moved over time, and which older patents still anchor the field.
Fusion-reactor claims dominate
G21B (fusion reactors) accounts for the large majority of records, with H05H (plasma and particle accelerators) a distant second at 42. Optics, polymer processing, coatings and catalysis subclasses each sit under 15 records, marking them as comparatively open ground.
A sharp rise-then-fall filing curve
Filings climbed to a peak of 32 in 2018 from 23 in 2017, then fell steadily to just 1 filing at the 2022 midpoint before recovering slightly. Because publication lags filing by roughly 18 months, the most recent years understate true filing activity.
Foundational fabrication patents still anchor the field
The most-cited records are capsule-fabrication patents on conducting-surface glass microspheres and carbonized composite foams, both cited well above any other record in the set. Citation leadership here reflects age and foundational status more than current commercial weight.
Filing is concentrated in the US and PCT route
The United States receives the largest single share of filings (92), with WIPO/PCT (32) and the EPO (24) next. Canada, Japan and the UK each receive single-digit counts, indicating limited deliberate multi-jurisdiction strategy outside the US-PCT-Europe core.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to inertial confinement fusion nuclear fuel, with the prior art for and against each one.
Who is filing, and where the claim space is still open
Filing is led by a small set of national labs, defence-linked entities and specialist fusion companies, with a long tail of single-filing entrants. Recent-year momentum has shifted toward newer commercial fusion ventures even as legacy assignees show no new filings in the latest year.
A small core of repeat filers
Co-assignee pairing data shows a handful of strong internal collaborations — including a six-filing pairing between two named inventors and several national-lab-to-lab pairings — sitting alongside a much larger number of single-filing entrants.
Newer commercial entrants are the only ones still filing
Among the assignees tracked for recent-year momentum, only a newer laser-fusion company shows filings in the latest year; the legacy national-lab and energy-department assignees in the same set show zero filings in that year.
US-centred filing strategy
The United States is the dominant receiving office, well ahead of the WIPO/PCT route and the EPO. Canada, Japan and the UK receive only single-digit filing counts, suggesting most assignees are not pursuing broad multi-jurisdiction protection.
| Assignee | Recent year | YoY |
|---|---|---|
| Blue Laser Fusion, Inc. | 2 | — |
| Lawrence Livermore National Security, LLC | 0 | — |
| Alpha Ring International, Ltd. | 0 | — |
| INNOVEN ENERGY LLC | 0 | — |
| United States Department of Energy | 0 | — |
| Hamamatsu Photonics K.K. | 0 | — |
| LAMONT JOHN S | 0 | — |
| HUNTER JR ROBERT O | 0 | -100% |
Where to take this analysis
The filing and citation data point to specific next questions for anyone deciding where to file, litigate or partner in this space.
Run a freedom-to-operate check on capsule-drive geometry
The oscillatory-compression claim family held by Lawrence Livermore National Security, LLC covers a specific two-stage compression sequence; any new drive-geometry filing should be checked against it and the surrounding G21B claim set before scoping.
Check claims in EurekaScope claims in the thinner classification codes
C08J, B05D, B01J and G02B all carry far fewer records than G21B, making cryogenic coating methods, capsule-shell polymer chemistry and beam-delivery optics the more open ground for a first claim.
Explore white space in EurekaWatch which assignees keep filing after the 2018 peak
Legacy national-lab assignees show no filings in the latest tracked year, while newer commercial fusion entrants continue to file — a shift worth monitoring for partnership or licensing decisions.
Track assignee momentum in EurekaCommon questions about ICF fuel-capsule patents
The tracked dataset contains 188 published patent families filed between 2015 and mid-2026 that combine inertial confinement fusion, ICF or laser fusion terminology with deuterium-tritium target, fuel capsule or cryogenic fuel layer language. This is a narrow, technically defined slice of nuclear fusion patenting, not the whole fusion-reactor field. Most of these records classify under G21B (fusion reactors), with a secondary cluster in H05H (plasma and particle accelerators).
The most-cited records in this corpus are older capsule-fabrication patents: US4459145A on glass microspheres with conducting surfaces (117 citations) and two related carbonized composite foam patents, US5047225A and US4992254A (111 and 75 citations respectively). High citation counts inside a fixed search corpus tend to favour older, foundational filings, so treat these as markers of technical influence rather than current commercial dominance. Lawrence Livermore National Security, LLC is the assignee behind more recent capsule-geometry claims, including the representative record covered in this analysis.
Filings peaked at 32 in 2018, then declined through the following years, reaching just 1 filing at the 2022 midpoint before ticking up again. This pattern is consistent with an early wave of capsule and drive-geometry claims being staked out, followed by a quieter period, rather than the field disappearing. Because publication typically lags filing by around 18 months, the drop-off in the final year or two of the window is partly an artefact of records not yet having published, and should not be read as a definitive falloff.
The classification data shows heavy concentration in G21B and H05H, with much thinner coverage in C08J (polymer processing), B05D (coating processes), B01J (chemical/physical processing) and G02B (optics) — each under 15 of the 188 records. That points to cryogenic fuel-layer coating methods, capsule-shell polymer formulations, and specific beam-delivery optical trains as areas with room for a first claim, rather than the fusion-reactor or drive-geometry space where filing density is already high. Anyone filing there should scope claims narrowly around a specific material, coating process or optical configuration rather than the broader capsule or reactor concept.
US20200327998A1, assigned to Lawrence Livermore National Security, LLC and published 2020-10-15, claims a method of applying oscillatory compression to a spherical target capsule in a specific sequence — radial compression first, then diametric compression to drive the capsule into an ovoid shape before implosion. It is a drive-geometry and compression-sequence claim, not a claim over deuterium-tritium fuel composition or cryogenic fuel-layer chemistry. Work on fuel-layer materials, capsule-shell coatings or alternative compression sequences that do not follow this exact two-stage radial-then-diametric order sits outside its scope, though a freedom-to-operate review of the full claim set is advisable before committing to any specific drive geometry.
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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.