Lightbridge Receives Notice of Allowance on New U.S. Patent for its Metallic Fuel Assemblies for CANDU Reactors
Rhea-AI Summary
Lightbridge (Nasdaq: LTBR) received a Notice of Allowance from the USPTO for U.S. Patent Application No. 18/383,668 titled “Fuel Assembly” on April 1, 2026. The allowed 16 claims cover spirally twisted, multi-lobed metallic fuel elements and assemblies for pressurized heavy-water reactors, including CANDU designs, with a moderator-to-fuel ratio of 2.4 or less. The application is a divisional of earlier U.S. filings and extends a patent family that includes four issued U.S. patents.
Positive
- Notice of Allowance for 16 claims covering multi-lobed fuel elements
- Claims explicitly cover use in CANDU and pressurized heavy-water reactors
- Moderator-to-fuel ratio specification of 2.4 or less included in claims
- Application is divisional of existing family with four issued U.S. patents
Negative
- None.
News Market Reaction – LTBR
In the Apr 1 session, LTBR declined 0.38%, reflecting a mild negative market reaction. Argus tracked a peak move of +2.8% during that session. Argus tracked a trough of -10.0% from its starting point during tracking. Our momentum scanner triggered 12 alerts that day, indicating notable trading interest and price volatility.
Data tracked by StockTitan Argus on the day of publication.
Key Figures
Historical Context
| Date | Event | Sentiment | 24h Move | Catalyst |
|---|---|---|---|---|
| Mar 25 | Advisory board role | Positive | +3.3% | Joined DOE-funded BTN2M2 advisory board for nuclear materials research. |
| Mar 19 | Technical conference | Positive | -3.1% | Presented advanced nuclear fuel research and modeling at TMS2026. |
| Mar 18 | Engineering contract | Positive | -4.8% | Signed initial Stern Labs contract for thermal‑hydraulic performance testing. |
| Mar 16 | Policy support | Positive | +1.5% | Commended DOE’s UPRISE initiative expanding U.S. nuclear capacity targets. |
| Feb 25 | Earnings update | Neutral | +0.7% | Reported 2025 financials with higher R&D and strong cash position. |
24h Move is the share-price change in the day after each event; other market factors may also have contributed.
Recent news shows a mixed pattern: several positive updates were followed by both gains and selloffs, with 3 aligned and 2 divergent reactions.
Over the last few months, Lightbridge has highlighted R&D progress, policy positioning, and capital strength. A $6 million DOE-backed research consortium role and a Stern Laboratories engineering contract advanced technical validation efforts. Policy support was underscored by the DOE’s UPRISE nuclear initiative, while fiscal 2025 results showed higher R&D and G&A alongside strong cash. Against this backdrop, the new U.S. patent allowance further expands its intellectual property, adding to prior technical and strategic milestones.
Key Terms
notice of allowance regulatory
united states patent and trademark office regulatory
fuel assembly technical
pressurized heavy-water reactors technical
candu-type technical
fissile material medical
cladding technical
moderator-to-fuel ratio technical
AI-generated analysis. How Rhea-AI works. Not financial advice.
RESTON, Va., April 01, 2026 (GLOBE NEWSWIRE) -- Lightbridge Corporation (“Lightbridge” or the “Company”) (Nasdaq: LTBR), an advanced nuclear fuel technology company, today announced that it has received a Notice of Allowance from the United States Patent and Trademark Office (“USPTO”) for U.S. Patent Application No. 18/383,668, titled “Fuel Assembly.” The application covers 16 claims directed to fuel assemblies and nuclear reactors incorporating Lightbridge’s proprietary spirally twisted, multi-lobed fuel element technology, designed for pressurized heavy-water reactors, including CANDU-type designs.
The allowed claims describe a fuel assembly comprising a plurality of elongated fuel elements, each having a spirally twisted, multi-lobed profile that defines a plurality of spiral ribs. Each fuel element includes a fuel kernel with fissile material disposed in a matrix of metal non-fuel material, surrounded by cladding, with a moderator-to-fuel ratio of 2.4 or less. The patent encompasses both the fuel assembly itself and a nuclear reactor incorporating the assembly in a pressurized heavy water reactor. This application is a divisional of U.S. Patent Application No. 17/237,683 (now issued as U.S. Patent No. 11,837,371), part of a patent family extending back to PCT/US2011/036034, which includes four previously issued U.S. patents.
Seth Grae, President and Chief Executive Officer of Lightbridge Corporation, commented, “This Notice of Allowance further strengthens our U.S. intellectual property portfolio, particularly for our multi-lobed fuel element design optimized for pressurized heavy water reactors. The CANDU reactor fleet represents a significant global market opportunity, and this patent further reinforces our technology’s applicability to heavy-water reactor designs. Our growing patent portfolio, spanning the United States, Canada, and other key jurisdictions worldwide, underscores the foundational and differentiated nature of Lightbridge Fuel™.”
About Lightbridge Corporation
Lightbridge Corporation (NASDAQ: LTBR) is focused on developing advanced nuclear fuel technology essential to delivering abundant, zero-emission, clean energy and providing energy security to the world. The Company is developing Lightbridge Fuel™, a proprietary next-generation nuclear fuel technology for existing light-water and pressurized heavy-water reactors, significantly enhancing reactor safety, economics, and proliferation resistance. The Company is also developing Lightbridge Fuel for new small modular reactors to deliver the same benefits, plus load-following with renewables, on a zero-carbon electric grid.
Lightbridge has entered into two long-term framework agreements with Battelle Energy Alliance, LLC, the United States Department of Energy’s operating contractor for Idaho National Laboratory, the United States’ lead nuclear energy research and development laboratory. DOE’s Gateway for Accelerated Innovation in Nuclear program has twice awarded Lightbridge to support the development of Lightbridge Fuel over the past several years. An extensive worldwide patent portfolio backs Lightbridge’s innovative fuel technology. Lightbridge is included in the Russell 2000® and Russell 3000® Indexes. For more information, please visit www.ltbridge.com.
To receive Lightbridge Corporation updates via e-mail, subscribe at https://www.ltbridge.com/investors/news-events/email-alerts
Lightbridge is on YouTube. Subscribe to access past demonstrations, interviews, and other video content at https://www.youtube.com/@lightbridgecorporation
Lightbridge is on X (formerly Twitter). Sign up to follow @LightbridgeCorp at http://twitter.com/lightbridgecorp.
Forward Looking Statements
With the exception of historical matters, the matters discussed herein are forward-looking statements. These statements are based on current expectations on the date of this news release and involve a number of risks and uncertainties that may cause actual results to differ significantly from such estimates. The risks include, but are not limited to: Lightbridge’s ability to commercialize its nuclear fuel technology; the degree of market adoption of Lightbridge’s product and service offerings; Lightbridge’s ability to fund general corporate overhead and outside research and development costs; market competition; our ability to attract and retain qualified employees; dependence on strategic partners; demand for fuel for nuclear reactors; Lightbridge’s ability to manage its business effectively in a rapidly evolving market; the availability of nuclear test reactors and the risks associated with unexpected changes in Lightbridge’s fuel development timeline; the increased costs associated with metallization of Lightbridge’s nuclear fuel; public perception of nuclear energy generally; changes in the political environment; risks associated with war in Europe; changes in the laws, rules and regulations governing Lightbridge’s business; development and utilization of, and challenges to, Lightbridge’s intellectual property; risks associated with potential shareholder activism; potential and contingent liabilities; as well as other factors described in Lightbridge’s filings with the Securities and Exchange Commission (the “SEC”). Lightbridge does not assume any obligation to update or revise any such forward-looking statements, whether as the result of new developments or otherwise, except as required by law. Readers are cautioned not to put undue reliance on forward-looking statements.
A further description of risks and uncertainties can be found in Lightbridge’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025, and in its other filings with the SEC, including in the sections thereof captioned “Risk Factors” and “Forward-Looking Statements,” all of which are available at http://www.sec.gov/ and www.ltbridge.com.
Investor Relations Contact:
Matthew Abenante, IRC
Director of Investor Relations
Tel: +1 (347) 947-2093
ir@ltbridge.com
