Bioethanol Patents: Who Leads, Where the Gaps Are 2026
- 41.8% concentration. The five leading assignees hold 6,615 of 15,836 records in scope — a field with a genuine top tier, not a flat field of single filers.
- Filing has cooled from a 2017 peak. Filings ran 824 in 2017 and fell to 463 by 2021; the last complete year, 2024, sits at 272 — a documented 41% drop across that three-year span.
- Fermentation claims dominate, fuel-blend claims trail. C12P fermentation and enzymatic synthesis touches 54.9% of records while C10L fuel composition sits at just 9.3% — the claim density is upstream, not at the pump.
Filing growth compares 2021 (463 records) with 2024 (272) — 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 15,836 records in scope (CR5), not by the ranked leaders only.
What the bioethanol patent record actually covers
The corpus in scope spans 15,836 records filed against feedstock conversion, fermentation process and fuel composition claims tied to bioethanol, ethanol biofuel and renewable ethanol terminology. Filing activity peaked in 2017 at 824 records and has declined since, though the most recent years understate true activity because publication typically lags filing by around 18 months. Coverage runs from 2015 through the 2026 data cut-off, capturing both the enzymatic-conversion wave tied to second-generation cellulosic ethanol and a later cluster of gene-editing filings adjacent to microbial strain engineering.
Reading this landscape means separating where claims are dense from where they are merely numerous. Fermentation and microorganism engineering subclasses carry the bulk of filings, while fuel-composition and bioreactor-apparatus claims are comparatively thin — a gap that matters more to a process engineer deciding where to file than a raw record count does.
Filing trend and technology composition
Two views of the same 15,836-record corpus: filing volume by year, and the IPC subclasses those records are tagged against. Because a single record can carry several IPC classes, the composition shares add up to more than 100% of the record total.
A 2017 peak followed by a multi-year pullback
Filings ran at 824 in 2017, the peak year in the dataset, then eased to 463 by 2021 and 272 by 2024 — a documented 41% decline across that three-year span. Years after 2024 are still filling in under publication lag and should not be read as a continued fall.
Fermentation and microorganism classes carry the field
C12P (fermentation & enzymatic synthesis) appears on 54.9% of the 15,836 records and C12N (microorganisms & genetic engineering) on 45.3%. Fuel-composition class C10L trails at 9.3%, and bioreactor apparatus class C12M sits at 7.1% — the claim pressure sits well upstream of the finished fuel blend.
Shares are the percentage of the 15,836 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaA recent filing shows where the field is still moving
Process and apparatus for producing bioethanol without CO2 emissions by conversion of syngas from thermal conversion of waste
The invention describes a process and apparatus for producing bioethanol without CO2 emissions by anaerobic fermentation of a synthesis gas produced through high-temperature thermal conversion of municipal solid waste, agricultural waste, refuse-derived fuel or non-recyclable plastic waste. Extra hydrogen is added via electrolysis to balance the H2/CO ratio, maximizing conversion of organic components during fermentation and preventing CO2 emission to atmosphere.Filed under US20240344092A1 — combines thermal gasification of mixed waste streams with syngas fermentation, a route distinct from the cellulosic-biomass fermentation that dominates the older, most-cited literature.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2005074656A2 | Polypeptides having cellulolytic enhancing activity and polynucleotides encoding same | 918 |
| 2 | US20160208243A1 | Novel crispr enzymes and systems | 863 |
| 3 | WO2005074647A2 | Polypeptides having cellulolytic enhancing activity and polynucleotides encoding same | 854 |
| 4 | US20020164730A1 | Procedure for the production of ethanol from lignocellulosic biomass using a new heat-tolerant yeast | 790 |
| 5 | US9790490B2 | CRISPR enzymes and systems | 757 |
| 6 | WO2005047499A1 | Polypeptides having beta-glucosidase activity and polynucleotides encoding same | 692 |
| 7 | WO2007019442A2 | Polypeptides having beta-glucosidase activity and polynucleotides encoding same | 577 |
| 8 | WO2007089290A2 | Methods for enhancing the degradation or conversion of cellulosic material | 550 |
| 9 | WO2011041397A1 | Polypeptides having cellulolytic enhancing activity and polynucleotides encoding same | 534 |
| 10 | WO2008057637A2 | Methods of increasing secretion of polypeptides having biological activity | 532 |
Citation counts favour older filings inside any searched corpus — read them as a signal of influence within this dataset, not as a ranking of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three signals worth acting on: where filing concentration sits, how the pace has actually moved, and which technology branches carry the real claim density.
A genuine top tier, not a flat field
The five leading assignees combine for 6,615 of the 15,836 records in scope, and the top 10 extend that to 54.1% (8,560 records). That is a field where a handful of portfolios set the terms for freedom-to-operate review, rather than one fragmented across many small filers.
Volume has cooled from its 2017 peak
Filings ran 824 in 2017, the highest year on record, and had fallen to 463 by 2021 and 272 by 2024 — a 41% drop across that span. Years beyond 2024 are still filling in under normal publication lag and should not yet be read as a further decline.
Claim density sits upstream of the fuel blend
C12P and C12N together dominate the tagging, while fuel-composition class C10L reaches only 9.3% of records and bioreactor-apparatus class C12M just 7.1%. Process and enzyme claims are far more contested than downstream fuel-formulation or hardware claims.
A small number of tight filing partnerships
Only 10 co-assignee pairs appear in the dataset, but the strongest pair shares 582 records — evidence of a deep, sustained joint-filing relationship between two research institutions rather than a broad web of shallow collaborations.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to bioethanol patent landscape, with the prior art for and against each one.
Who is filing, and where momentum is fading
The assignee ranking covers 100 companies counted by record volume — not a curated top-50 or top-100 list, but the full ranking the dataset returns. Momentum by assignee reads mostly downward in the latest tracked year, which is expected given publication lag rather than a sign the underlying research has stopped.
One portfolio well ahead of the field
The leading assignee holds 2,461 records, well clear of fifth place at 605 and tenth place at 315 — a steep drop-off that marks a genuine leader rather than a cluster of near-equal filers.
Latest-year counts have thinned across the board
Several of the most active historical filers show sharp year-on-year declines in the latest tracked year, including one at -73% and others reporting zero filings that year. Given the roughly 18-month publication lag, this reads as incomplete recent data rather than a stopped research pipeline.
Joint filings cluster around a few institutional pairs
Beyond the single strongest pair at 582 shared records, a second pair shares 464 and a third 240 — collaboration in this field concentrates into a handful of deep, repeat partnerships rather than being spread thinly.
| Assignee | Recent year | YoY |
|---|---|---|
| Novozymes | 3 | -73% |
| Massachusetts Institute of Technology | 2 | -89% |
| The Broad Institute, Inc. | 2 | -89% |
| Xyleco, Inc. | 0 | — |
| Novozymes A/S | 0 | -100% |
| DSM IP Assets B.V. | 0 | -100% |
| LanzaTech New Zealand Ltd. | 0 | — |
| Danisco US Inc. | 0 | — |
Where to take this analysis
The figures here describe the shape of the field. Turning that into a filing or freedom-to-operate decision means going deeper on specific claims and specific assignees.
Run a freedom-to-operate check on a specific route
Concentration at the top of the ranking means clearance work should start with the leading assignees' claim scope before drafting new fermentation or strain-engineering claims.
Explore Eureka's FTO workflowsTrack momentum shifts as new publications land
Given the publication lag, the last two tracked years are not final. Set up ongoing monitoring rather than relying on a single snapshot.
Set up filing alerts in EurekaInvestigate the under-claimed branches directly
Fuel-composition and bioreactor-hardware claims sit well below fermentation claim density — worth a targeted prior-art search before committing R&D there.
Search white space in EurekaCommon questions on the bioethanol patent landscape
One assignee leads the ranked field with 2,461 records, well ahead of the fifth-place holder at 605 and the tenth-place holder at 315. This drop-off pattern indicates a genuine leader rather than several closely matched filers. The top five assignees combined hold 41.8% of all 15,836 records in scope, and the top ten extend that to 54.1%, so any freedom-to-operate review in this space should start by mapping the leading portfolios' claim scope before anything else.
Filing peaked in 2017 at 824 records and has declined since, falling to 463 by 2021 and to 272 by 2024, a documented 41% drop across that three-year span. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so they should not be read as evidence of a further slowdown. The honest read is a field that has cooled from an earlier peak, with the most recent trend line still filling in.
Fermentation and enzymatic synthesis, IPC class C12P, appears on 54.9% of the 15,836 records in scope, and microorganism and genetic-engineering class C12N appears on 45.3%. Fuel-composition claims under C10L reach only 9.3% of records, and bioreactor apparatus under C12M sits at 7.1%. Because a single record can carry multiple IPC classes, these shares add up to more than 100%, but the pattern is consistent: claim density sits in the biological conversion process, not the finished fuel blend or the hardware around it.
The clearest gaps sit in branches adjacent to the dominant fermentation and microorganism classes: fuel-composition claims (C10L), bioreactor and enzyme-delivery apparatus (C12M), animal-feed co-product valorisation (A23K), and natural macromolecule derivative processing (C08H) all carry single-digit percentage shares of the record total. Syngas-to-ethanol fermentation from mixed waste streams, as shown in a recent 2024 filing, is another route that sits outside the traditional cellulosic-biomass fermentation cluster that dominates the highly cited older literature. These are areas where claim space is comparatively open rather than already occupied by a leading portfolio.
It is moderately concentrated: the five leading assignees account for 41.8% of the 15,836 records in scope, and the ten leading assignees account for 54.1%. That leaves a substantial long tail among the remaining ranked assignees, so the field is neither dominated by a single monopoly filer nor evenly spread across hundreds of small entrants. For a competitive-intelligence team, this means the leading handful of portfolios deserve close individual review, while the long tail is better handled with a broader landscape scan than a company-by-company one.
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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.