How Rondo Energy Stores Electricity as High-Temperature Industrial Heat
A system that converts cheap renewable electricity into continuous, high-temperature heat for factories by using two stages of thermal storage units that can charge and discharge independently.
Original patent title: “Thermal energy storage systems for use in material processing”
A system that converts cheap renewable electricity into continuous, high-temperature heat for factories by using two stages of thermal storage units that can charge and discharge independently. Granted to Rondo Energy Inc in 2025 with 15 claims.
Key facts
Coverage
What does this patent actually cover?
This system uses a two-stage thermal battery design to turn electricity into steady industrial heat. A primary storage unit is heated by electricity, which then warms a working fluid. This fluid travels to secondary storage units, which act as heat exchangers to warm up a process gas for industrial use. By having multiple secondary units, the system can charge one unit while another is discharging, ensuring the factory receives a constant stream of heat even if the electricity source is intermittent.
The gap
What does this patent NOT cover?
- Does not cover systems that lack a two-stage architecture with primary and secondary storage units.
- Does not cover direct electrical heating of process gases without the intermediate working fluid stage.
- Does not cover thermal storage systems that cannot operate in charging and discharging modes simultaneously.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The system uses a two-stage design where the working fluid and the process gas can be at different pressures and compositions, allowing the heat storage medium to be isolated from the industrial process gas itself.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Rondo Heat Battery
Industrial brick-based thermal energy storage
Renewable-powered cement manufacturing
Why it matters
The bigger picture
Industrial processes like cement and steel production require massive amounts of constant heat, usually provided by burning fossil fuels. This patent provides a pathway to replace those fuels with renewable electricity by solving the 'intermittency problem'—the fact that wind and solar power aren't always available when a factory needs them.
Filed
December 3, 2024
Granted
December 2, 2025
Market context
Who's building on this
Companies in this space
Rondo Energy is the primary developer of this specific brick-based thermal storage technology. Other companies in the broader thermal energy storage space, such as Antora Energy and Brenmiller Energy, are also working on similar concepts to decarbonize industrial heat.
Market impact
This technology addresses the hard-to-abate industrial sector, which accounts for a significant portion of global carbon emissions. By enabling the use of low-cost, variable renewable energy for high-temperature processes, it creates a bridge between the electrical grid and heavy industry, potentially reducing reliance on natural gas for process heat.
Claim 1 — Plain English
What this patent covers
This system uses a two-stage thermal battery design to turn electricity into steady industrial heat. A primary storage unit is heated by electricity, which then warms a working fluid. This fluid travels to secondary storage units, which act as heat exchangers to warm up a process gas for industrial use. By having multiple secondary units, the system can charge one unit while another is discharging, ensuring the factory receives a constant stream of heat even if the electricity source is intermittent.
The clever bit
The system uses a two-stage design where the working fluid and the process gas can be at different pressures and compositions, allowing the heat storage medium to be isolated from the industrial process gas itself.
What it does not cover
- Does not cover systems that lack a two-stage architecture with primary and secondary storage units.
- Does not cover direct electrical heating of process gases without the intermediate working fluid stage.
- Does not cover thermal storage systems that cannot operate in charging and discharging modes simultaneously.
Patent timeline
Application submitted to the patent office
Application published, typically 18 months after filing
Patent officially issued
PatentBrief Score
Impact Score
Early stage
Citation count
0/40
No citations yet
Claim breadth
10/20
Broad claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
Recency
20/20
Granted within 5 years
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$23K – $72K
Midpoint $45K · 18.5 yr remaining · industry baseline
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
The original legal language
Original claims
15 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Treynor, C., O'Donnell, J. S., Behrens, P. E. V., Ferhani, Y. D., & JONEMANN, M. (2025). How Rondo Energy Stores Electricity as High-Temperature Industrial Heat (U.S. Patent No. 12,486,789). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/12486789/spacex-structures-philosophy
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How Rondo Energy Stores Electricity as High-Temperature Industrial Heat cover?
A system that converts cheap renewable electricity into continuous, high-temperature heat for factories by using two stages of thermal storage units that can charge and discharge independently.
Who owns patent US 12486789?
Rondo Energy Inc owns this patent, granted in 2025.
When does this patent expire?
This patent is expected to expire on December 2, 2045, when the invention enters the public domain.
What problem does this patent solve?
Industrial processes like cement and steel production require massive amounts of constant heat, usually provided by burning fossil fuels. This patent provides a pathway to replace those fuels with renewable electricity by solving the 'intermittency problem'—the fact that wind and solar power aren't always available when a factory needs them.
What does this patent NOT cover?
Does not cover systems that lack a two-stage architecture with primary and secondary storage units.
Patent monitoring