Geothermal Corrosion Control Patents: Leaders & Trends 2026
A patent landscape analysis of geothermal corrosion control technology: filing trends since 2015, the assignee ranking, IPC composition across water treatment, corrosion inhibitors and drilling classes, and the most-cite
Filing growth = 2021 (8 records) → 2024 (10); 2024 is the last year we treat as complete.
What this landscape covers
Geothermal brine carries dissolved silica, sulfides and scale-forming minerals that attack well casing, heat exchangers and surface piping. Geothermal corrosion control patents cover the chemistry and process routes used to slow that attack: pH modification, scale and silica inhibitors, biocides, and corrosion-resistant treatment chemistries applied at the wellhead or in surface loops. This landscape maps 117 published records filed or published between 2015 and the 2026-07-31 data cut-off, drawing on a search across titles and claims for geothermal-specific corrosion regulation language.
The scope sits at the intersection of oilfield chemistry and geothermal engineering: many of the most-cited records originate in oil and gas service companies whose brine-handling chemistry transferred into geothermal wells. That heritage shapes the IPC composition below, where water treatment and corrosion-inhibitor classes outweigh drilling-specific classes.
Filing trend and technology composition
The two views below use the same 117-record scope: one tracks filings by year, the other breaks the corpus down by IPC subclass. Because a single record can carry several IPC codes, the subclass shares add up to more than 100%.
A growth phase followed by an incomplete tail
Filings peaked in 2019 at 25 records, well above the 2021 and 2024 levels. The 2021-to-2024 span shows +25% growth (8 to 10 records) and is the most recent period the dataset can treat as complete; 2025 and 2026 are still filling in as publications catch up to filing dates, roughly an 18-month lag, so no conclusion about a slowdown can be drawn from the most recent years.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Chemistry classes dominate over metallurgy and drilling classes
C02F (water & wastewater treatment) and C09K (materials for misc. applications) each sit near 45% of the 117 records, and C23F (corrosion & metal removal) follows at 39.3%. Smaller shares in C07C, A01N, C08G, E21B and F24D show inhibitor chemistry, biocide formulation and drilling/heating equipment are present but far less contested than the top three classes.
Shares are the percentage of the 117 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Enhanced Geothermal Systems: Geothermal Corrosion Control Patent Landscape with Eureka
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Try EurekaMost-cited prior art and a representative filing
US5656172A — pH modification of geothermal brine with sulfur-containing acid
Sulfur-containing acid is produced at a geothermal energy source from hydrogen sulfide produced as part of a geothermal process and introduced into aqueous liquid brine to lower the pH of the liquid brine. The lowered pH of the brine inhibits silica, metal sulfide and/or calcite formation on the surfaces of geothermal energy processing equipment or in subterranean formations in which the brine is injected.Filed by Union Oil Company of California, granted 1997-08-12. One of the five most-cited records in this landscape, cited 65 times within the searched corpus.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US8309498B2 | High temperature fracturing fluids and methods | 70 |
| 2 | US4088583A | Composition and method for drilling high temperature reservoirs | 69 |
| 3 | US5656172A | pH modification of geothermal brine with sulfur-containing acid | 65 |
| 4 | US5665242A | Inhibition of silica precipitation | 50 |
| 5 | US20190062187A1 | Use of di-ionic compounds as corrosion inhibitors in a water system | 48 |
| 6 | US5190664A | Brine heat exchanger treatment method | 29 |
| 7 | US20110067875A1 | High Temperature Fracturing Fluids and Methods | 28 |
| 8 | US5061373A | Process for treating condensate of steam derived from geothermal brine | 25 |
| 9 | WO2019046409A1 | Molecules having one hydrophobic group and two identical hydrophilic ionic groups and compositions thereof | 24 |
| 10 | US6153106A | Method for inhibiting the formation and deposition of silica scale in water systems | 24 |
Citation counts reflect influence within this searched corpus and skew toward older records; they are not a measure of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once the ranking, the IPC composition and the citation table are read together: a concentrated top, a chemistry-heavy claim map, and prior art that still anchors freedom-to-operate analysis decades on.
One assignee dominates the ranked field
The leading assignee holds 56 records against 7 for the fifth-placed company and just 1 for the tenth, out of 20 ranked assignees. That is a steep drop rather than a gradual taper, which means most of the claim space that matters for corrosion-inhibitor chemistry sits with a small number of holders rather than being spread across the field.
Growth resumed after the 2019 peak
Filings peaked at 25 records in 2019, then activity has grown again through the last complete window: 8 records in 2021 rising to 10 in 2024. Because publication lags filing by roughly 18 months, 2025 and 2026 figures are not yet a reliable read on current activity.
Water-treatment chemistry outweighs metallurgy
C02F and C09K each cover close to 45% of the 117 records, ahead of the corrosion-specific class C23F at 39.3%. That ordering shows most applicants are claiming treatment chemistry and formulations rather than metallurgical or coating-based corrosion resistance, which is where a metallurgy-first filer might find more open ground.
Old fracturing-fluid and brine-treatment art still anchors the field
The five most-cited records include high-temperature fracturing fluid and brine pH-modification patents dating back decades, several from oil and gas service origins. Their citation counts are a signal of influence within this corpus, not evidence that the underlying chemistry is still the commercial standard.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to enhanced geothermal systems: geothermal corrosion control patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| HICKS PETER D | GRATTAN DAVID A | 3 |
| Nalco Company | HICKS PETER D | 1 |
| Nalco Company | GRATTAN DAVID A | 1 |
| Rhodia UK Limited | WOODWARD GARY | 1 |
| Rhodia UK Limited | OTTER GRAHAM | 1 |
| Rhodia UK Limited | HARDY JULIE | 1 |
| Rhodia UK Limited | DAVIS KEITH | 1 |
| Rhodia UK Limited | CARMICHAEL KIM | 1 |
Only 10 co-assignee pairs appear across the dataset, and the strongest pairing links two named inventors rather than two companies — co-assignment here looks more like internal inventor teams than cross-company joint filing.
Where to take this analysis
The ranking and IPC breakdown point to specific next steps depending on whether the goal is freedom-to-operate, sourcing a licence, or finding open claim space.
Map the leader's claim boundaries
With 56 records against a fifth-place count of 7, the top assignee's granted claims are worth reading in full before drafting anywhere near pH-modification or silica-inhibitor chemistry.
Explore assignee filings in EurekaTest white space outside the top three IPC classes
E21B, F24D and C08G each sit at only 6.0% of the 117 records, well below the water-treatment and corrosion classes — a candidate zone for claims that combine drilling or heating equipment with corrosion regulation.
Run an IPC gap search in EurekaCheck citation-heavy prior art before filing
The five most-cited records, several decades old, still anchor examiner searches in this field; a novelty check against them is a low-cost first step before drafting new claims.
Pull citation trees in EurekaQuestions practitioners ask about this landscape
It covers chemistry and process methods used to prevent or slow corrosion, scaling and silica deposition in geothermal wells and surface equipment, including pH modification of brine, scale and silica inhibitors, biocides and corrosion-resistant treatment formulations. It also includes some equipment-level claims tied to drilling and heating systems, though these are a smaller share of the field. The scope in this landscape was built from a search matching geothermal-specific corrosion regulation language in titles and claims across 117 published records.
The ranking of 20 assignees shows a steep concentration at the top: the leading company holds 56 records, compared with 7 for the fifth-placed assignee and 1 for the tenth. Several of the ranked companies have origins in oilfield chemical services, reflecting how brine-treatment chemistry developed for oil and gas wells transferred into geothermal applications. This is not a top-50 or top-100 list — it is the full ranking the dataset returns.
Filings peaked at 25 records in 2019 and, over the most recent complete window, grew 25% from 8 records in 2021 to 10 in 2024. Figures for 2025 and 2026 should not be read as a slowdown: patent publication typically lags filing by around 18 months, so the most recent years are still filling in as those applications publish. Treat 2024 as the last reliable data point in the trend.
Water and wastewater treatment (C02F) and materials for miscellaneous applications (C09K) each cover close to 45% of the 117 records, with corrosion and metal removal (C23F) close behind at 39.3%. Smaller classes covering acyclic compounds, biocides, condensation polymers, drilling and heating systems each sit at 12.8% or below. Because records can carry multiple IPC codes, these shares add up to more than 100% and are not mutually exclusive categories.
US5656172A, assigned to Union Oil Company of California and granted in 1997, claims lowering the pH of geothermal brine using sulfur-containing acid produced from hydrogen sulfide at the geothermal source, to inhibit silica, metal sulfide and calcite formation. It is one of the five most-cited records in this landscape, with 65 citations recorded in the searched corpus. Any new filing that proposes acid-based pH reduction of brine using in-situ hydrogen sulfide as the acid source should be checked against this claim scope before drafting.
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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.