In Situ Bioremediation Patents: Top Companies & Filing Trends 2026
Filing growth compares 2021 (23 records) with 2024 (29) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 844 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
In situ bioremediation sits at the intersection of two IPC domains that this dataset tracks together: B09C (soil and contaminated land reclamation) and C02F (water and wastewater treatment). The 844 records in scope span 2015 through the 2026 data cut-off and combine claims on microbial consortia, nutrient and electron-donor delivery, in-well and in-plume treatment systems, and monitoring methods for subsurface contamination.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend understate real activity. The 2024 filing count is the most recent year that can be read as complete, and it is the reference point for the growth figure used on this page.
Filing trends and technology composition
Two views of the same 844 records: how filing volume has moved year over year, and how claims distribute across the IPC subclasses that make up the field.
Filing trend, 2017-2026
Filings peaked at 36 in 2017, dipped, then climbed from 23 in 2021 to 29 in 2024 — a 26% increase over that three-year span. 2025 and 2026 figures are still filling in as later-filed applications publish, including the most recent year shown at 16.
Technology composition by IPC subclass
B09C (soil and contaminated land reclamation) and C02F (water and wastewater treatment) anchor the field at 73.0% and 66.1% of the 844 records respectively, since most filings claim remediation methods that touch both soil and water phases. Microorganism-related classes (C12N, C12R) and enzymatic/fermentation methods (C12P) trail well behind, marking biological-mechanism claims as a smaller, more specialised slice of the whole.
Shares are the percentage of the 844 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Soil & Groundwater Remediation: In Situ Bioremediation Patent Landscape with Eureka
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Try EurekaMost-cited records and a representative filing
WO2010096515A1 — In situ bioremediation using an enriched anaerobic microbial consortium
A method for in situ bioremediation of hydrocarbon-contaminated sites using an enriched steady state microbial consortium capable of modifying crude oil components under anaerobic denitrifying conditions is disclosed.Filed by E. I. du Pont de Nemours and Company, this filing illustrates a persistent claim pattern in the field: a defined microbial consortium plus a specified redox condition (here, anaerobic denitrifying) applied directly to a contaminated site.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5560737A | Pneumatic fracturing and multicomponent injection enhancement of in situ bioremediation | 194 |
| 2 | US5221159A | Subsurface contaminant remediation, biodegradation and extraction methods and apparatuses | 167 |
| 3 | US5833855A | In situ bioremediation of contaminated groundwater | 141 |
| 4 | US5733067A | Method and system for bioremediation of contaminated soil using inoculated support spheres | 137 |
| 5 | US6719902B1 | Fe(o)-based bioremediation of aquifers contaminated with mixed wastes | 134 |
| 6 | US5302286A | Method and apparatus for in situ groundwater remediation | 126 |
| 7 | US5855775A | Microporous diffusion apparatus | 114 |
| 8 | CN101947539A | 一种处理重金属污染物的土壤修复方法 | 113 |
| 9 | US5384048A | Bioremediation of contaminated groundwater | 111 |
| 10 | US5277518A | Contaminant remediation, biodegradation and removel methods and apparatus | 107 |
Citation counts favour older filings that have had more time to accumulate references within this corpus; read them as a signal of influence on the field's foundational methods, not of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Four findings that matter more than the raw counts on their own.
The top of the field is concentrated, the rest is a long tail
The leading assignee holds 57 records on its own, and the top 5 combined account for 14.8% of the 844 records in scope; the top 10 lift that to only 22.5%. Beyond the leader, filing counts drop fast — fifth place sits at 14, tenth at 12 — meaning most of the ranked 100 companies are single- or low-digit filers.
Activity is recovering, not fading
After a 2017 peak of 36 filings, annual counts grew from 23 in 2021 to 29 in 2024, a 26% increase over that span. The 2025-2026 dip in the raw count reflects publication lag rather than a real slowdown.
Soil and water claims dominate; biological-mechanism claims are the minority
B09C and C02F between them touch the large majority of records (73.0% and 66.1%), while microorganism- and enzyme-specific classes such as C12N, C12R and C12P sit well under a quarter of records each. That gap points to where mechanism-level claims — as opposed to system or method claims — remain less crowded.
Filing is split across offices, not funnelled through one route
China leads with 224 filings and the United States follows at 187, with Europe, WIPO/PCT, Canada and Australia each taking a meaningfully smaller share. Only 78 records route through the PCT system, suggesting most applicants are still filing nationally rather than seeking broad multi-jurisdiction protection.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to soil & groundwater remediation: in situ bioremediation patent landscape, with the prior art for and against each one.
Where to take this analysis
The figures above answer what the field looks like today. The questions below are what a filing or freedom-to-operate decision actually needs answered next.
Map the white space inside B09C and C02F
Claim density is high in soil-and-water method classes but thin in mechanism-specific classes like C12N and C12P. Before drafting, check whether a candidate consortium or delivery method actually sits in the crowded zone or the open one.
Explore technology white space in EurekaTrack the long tail, not just the leader
With the top 10 assignees holding only 22.5% of records, competitive risk is distributed across many small filers rather than concentrated in one incumbent. Monitoring should cover new entrants, not just the current leader.
Set up assignee monitoring in EurekaRead the most-cited records as foundations, not blockers
The highest-cited patents here date back to the 1990s and mid-2000s; many may be expired or narrowly scoped. Confirm current legal status before assuming they constrain a new filing.
Check patent status in EurekaCommon questions on in situ bioremediation patents
One assignee leads the 844-record dataset with 57 filings, well ahead of the rest of the field. The top 5 assignees combined hold 14.8% of all 844 records, and the top 10 hold 22.5%, which means concentration at the very top is real but the field as a whole is fragmented across roughly 100 ranked companies. Most of those companies hold only a handful of records each, so a competitive review needs to look well past the leader.
Filings grew from 23 in 2021 to 29 in 2024, a 26% increase over that three-year span, following an earlier peak of 36 filings in 2017. The apparent drop in 2025 and 2026 is a publication-lag artefact — applications filed in those years typically take about 18 months to publish, so the true count for those years is still filling in. Based on the 2021-2024 trend, the field is recovering rather than declining.
The dataset spans two core IPC domains: B09C for soil and contaminated land reclamation, present in 73.0% of the 844 records, and C02F for water and wastewater treatment, present in 66.1%. Smaller but distinct clusters cover microorganisms and genetic engineering (C12N, 21.2%), chemical detoxification (A62D, 12.6%), and fermentation or enzymatic synthesis (C12P, 8.2%). Because a single filing can carry several IPC codes, these shares add up to more than 100% and should be read as overlapping claim coverage, not a strict breakdown.
China is the largest receiving office with 224 filings, followed by the United States at 187. Europe via the EPO accounts for 85, WIPO/PCT filings for 78, Canada for 57 and Australia for 42. The relatively low PCT figure relative to national filings suggests that most applicants are pursuing single-jurisdiction protection rather than broad international coverage.
WO2010096515A1, filed by E. I. du Pont de Nemours and Company, claims a method for in situ bioremediation of hydrocarbon-contaminated sites using an enriched steady-state microbial consortium that modifies crude oil components under anaerobic denitrifying conditions. It is representative of a claim pattern common in this field: a defined consortium plus a specified redox condition applied directly at the contamination site. Whether it blocks a new filing depends on whether the new work uses a materially different consortium composition, contaminant type or redox condition — a freedom-to-operate check against its specific claim language is the only reliable way to confirm that.
The five most-cited records in this dataset date from the 1990s and early 2000s and cover pneumatic fracturing to enhance bioremediation, subsurface contaminant extraction and biodegradation apparatus, in situ groundwater bioremediation methods, inoculated support-sphere systems, and Fe(0)-based treatment of mixed-waste aquifers. High citation counts in this corpus reflect age and foundational influence rather than current commercial weight, since older patents have had more time to accumulate citations. Confirming legal status is essential before treating any of them as an active constraint.
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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.