MIC Corrosion Patents: Who Leads, Where the Gaps Are 2026
A patent landscape analysis of microbiologically influenced corrosion: filing trends since 2017, assignee concentration, IPC technology mix, and where white space remains for new filers.
Filing growth = 2021 (23 records) → 2024 (6); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 309 records in scope (CR5), not the ranked leaders only.
What the MIC corrosion patent record shows
Microbiologically influenced corrosion (MIC) sits at the intersection of microbiology and materials science: sulphate-reducing bacteria, acid-producing microbes and biofilms accelerate metal loss in pipelines, storage tanks and fire-protection systems well beyond what electrochemical corrosion models predict. The patent record for this topic is dominated not by coatings or alloy chemistry but by microbial population control — altering, inhibiting or modifying the microbiota responsible for the damage, rather than hardening the metal against it.
That skew shows up directly in the IPC mix: microorganism and biocide classes each cover roughly half of all 309 records in scope, while classes tied to corrosion protection itself, coatings or ceramics appear far less often. Filing activity concentrated early in the coverage window and has since thinned, though the most recent years are still filling in as publications catch up with filings made 18 months or so earlier.
Filing trend and technology composition
The two views below cover the same 309 records: one tracks filings by year, the other tracks which IPC subclasses those filings sit in.
Filings rose to a 2017 peak, then declined
Annual filings peaked at 30 in 2017. Using 2021 (23) through 2024 (6) — the last year unaffected by publication lag — filings fell 74% over that three-year span. Years after 2024 are still incomplete and should not be read as a continued decline.
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.
Biology-side classes dominate over corrosion-specific ones
C12N (microorganisms and genetic engineering), A01N (biocides) and A61K (medicinal preparations) each appear in roughly half of all records, while C23F, the corrosion and metal-removal class, appears in only 15.5%. Coatings (C09D) and ceramics (C04B) trail further behind. Records can carry multiple classes, so these shares sum to well over 100%.
Shares are the percentage of the 309 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Corrosion & Degradation: Microbiologically Influenced Corrosion Patent Landscape with Eureka
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Try EurekaRepresentative and most-cited filings
Methods for inhibiting microbiologically influenced corrosion of metals and alloys
Methods for inhibiting the microbiologically influenced corrosion of a metal are provided comprising treating the surface of the metal with a microbiologically influenced corrosion inhibiting effective amount of a source of rare earth metal ions; wherein the surface of the metal is in the presence of corrosive reagents such as chloride ions and acids and one or more microorganisms capable of colonizing on and/or embedding into the surface and preventing self-healing of the surface of the metal damaged by the corrosive reagents.Filed by The Johns Hopkins University, published 2005-03-31 as WO2005028707A2.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2016177682A1 | Altering microbial populations & modifying microbiota | 121 |
| 2 | US20160333348A1 | Altering microbial populations & modifying microbiota | 112 |
| 3 | US20100263882A1 | System and method for fire protection system corrosion mitigation | 96 |
| 4 | US9701964B2 | Altering microbial populations and modifying microbiota | 83 |
| 5 | US20180273940A1 | Treating and preventing microbial infections | 81 |
| 6 | US20170246221A1 | Altering microbial populations & modifying microbiota | 81 |
| 7 | US20170196225A1 | Altering microbial populations & modifying microbiota | 79 |
| 8 | US5246560A | Apparatus for monitoring biofilm activity | 70 |
| 9 | US20180146681A1 | Altering microbial populations & modifying microbiota | 68 |
| 10 | US20180084785A1 | Altering microbial populations & modifying microbiota | 68 |
Citation counts favour older records inside this searched corpus and should be read as a signal of influence on the field, not 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 trend and the IPC mix are read together.
The field is led by one dominant filer, not a crowded field
A single assignee holds 116 of the 309 records in scope, and the top 5 combined hold 68.3%. That is a narrow leadership group for a cross-disciplinary field — new entrants are competing against a small number of deep portfolios rather than a fragmented landscape.
Peak filing activity has passed, on the data available so far
Filings peaked at 30 in 2017 and fell to 6 by 2024, a 74% drop over the 2021-2024 window that can be read as complete. That decline may reflect claim space filling in around microbial-control approaches rather than the underlying problem losing relevance.
Most claims target the microbe, not the metal
C12N, A01N and A61K — microorganism, biocide and medicinal-preparation classes — each cover roughly half of all 309 records, while the dedicated corrosion class C23F covers only 15.5%. Filers are largely claiming biological intervention rather than coatings, alloys or corrosion-protection mechanisms.
Filing is US-centred with a modest international spread
The United States receives the largest share of filings at 112 records, with Europe, Israel, Australia, Canada and Hong Kong each in the high teens to twenties. That pattern suggests protection strategies built around a US home market first, then selective international filing.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to corrosion & degradation: microbiologically influenced corrosion patent landscape, with the prior art for and against each one.
Where to take this analysis
The concentration at the top and the skew toward microbial-control claims both point to specific next steps for a filing or freedom-to-operate review.
Map the leader's actual claim boundaries
Before filing near microbial-population control, pull the granted claims of the top assignee directly rather than relying on the IPC class alone — the class overlap between C12N, A01N and A61K means several distinct claim strategies are grouped together in the data.
Explore assignee portfolios in EurekaTest the corrosion-protection branch for white space
C23F coverage sits at just 15.5% of records against roughly half for the microbiology classes, which suggests coating- and alloy-side corrosion protection for MIC-prone environments is comparatively under-claimed.
Run a white space search in EurekaRecheck the trend once 2025-2026 data settles
The apparent decline after 2021 is real through 2024 but the two most recent years are still filling in under normal publication lag; revisit the trend line before concluding the field has cooled.
Set a filing alert in EurekaFrequently asked questions
Microbiologically influenced corrosion (MIC) is metal degradation accelerated or caused by microorganisms such as sulphate-reducing bacteria and biofilm-forming microbes, rather than by electrochemical processes alone. Because the root cause is biological, a large share of the patent activity in this space targets the microbe population directly — through biocides, genetic modification of microbiota, or medicinal-style compounds — instead of the metal surface. That is why classes like C12N and A01N appear in roughly half of the 309 records in scope, while the dedicated corrosion class C23F appears in only 15.5%.
The assignee ranking covers 66 ranked companies from the 309 records in scope, and it is heavily front-loaded: one leader alone holds 116 records, and the top 5 combined hold 68.3% of all filings. That leaves a long tail of smaller filers with far fewer records each. Anyone assessing freedom to operate should focus review effort on the small leadership group first, since it accounts for the large majority of the concentrated claim space.
Filings peaked at 30 per year in 2017 and, using the 2021-2024 window that can be treated as complete, fell 74% to 6 filings by 2024. That is a real decline over that span, not a projection. The two most recent years in the dataset are still incomplete because publication typically lags filing by around 18 months, so it is too early to read 2025 or 2026 as confirming a continued drop.
The dominant classes are biological rather than metallurgical: C12N (microorganisms and genetic engineering) covers 51.1% of the 309 records, A01N (biocides) covers 50.8%, and A61K (medicinal preparations) covers 50.5%. Corrosion-specific class C23F covers only 15.5%, with coatings (C09D) and ceramics (C04B) trailing further. Since records can carry multiple IPC classes, these figures overlap and sum to more than 100%, but the pattern is consistent: most claims address the organism, not the material.
The clearest gap sits in corrosion-protection-specific claims: C23F and coatings-class C09D together cover a much smaller share of the 309 records than the microbiology-heavy classes do, at 15.5% and 11.0% respectively. That suggests alloy-side or coating-side approaches to resisting MIC — as opposed to controlling the microbial population — are comparatively under-claimed. A new filer targeting material-side mitigation rather than biocide or genetic approaches would face a thinner prior-art base in this dataset.
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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.