Stirred-Tank Bioreactor Patents: Who Leads, Where Gaps Are 2026
- Half the field sits with five filers. The top 5 assignees combined hold 92 of 184 records in scope (50.0%), and the top 10 hold 143 (77.7%) — vessel design claim space is heavily staked by a small group.
- Filing has cooled from its 2021 level. Filings ran 7 in 2021 down to 2 in 2024, a -71% swing over that span, after peaking at 15 in 2023; 2025-26 counts are still filling in as publications lag filing by about 18 months.
- Mixing and stirring claims are a minority overlay. Only 16.8% of the 184 records carry a B01F mixing/stirring class alongside the core C12M bioreactor class (98.9%), pointing to a gap between vessel geometry claims and agitation-mechanism claims.
Filing growth compares 2021 (7 records) with 2024 (2) — 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 184 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Stirred-tank bioreactor vessel design sits at the intersection of mechanical engineering and bioprocessing: tank geometry, aspect ratio, headspace and working-volume relationships, port layout, and surface finish and drainability requirements that determine whether a vessel can be validated for GMP cell culture. The search combines these vessel-design terms with the core bioreactor apparatus classes (C12M, B01F, C12M3/00), producing a 184-record set spanning 2015 through the July 2026 data cut-off.
Because publication trails filing by roughly a year and a half, the most recent one to two years in any trend understate real filing activity. The 2024 figure is the most recent year that can be read as a complete signal.
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Filing trend and technology composition
Two views of the same 184-record set: how filing activity has moved year over year, and how records distribute across IPC subclasses.
Filing trend: a 2023 peak, then a pullback
Annual filings rose from 9 in 2017 to a peak of 15 in 2023, then fell — filings dropped from 7 in 2021 to 2 in 2024, a -71% change over that span. Treat 2025 and 2026 as incomplete rather than as confirmation the field is shrinking.
Technology composition by IPC subclass
C12M (bioreactors and enzyme apparatus) covers 98.9% of the 184 records, as expected given the search scope. C12N (microorganisms and genetic engineering) appears in 27.7% and B01F (mixing and stirring) in 16.8%, with smaller shares in C07K, C12Q, B01L, G01N and A23L — each record can carry multiple classes, so these shares add up past 100%.
Shares are the percentage of the 184 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Stirred-Tank Bioreactor Vessel Design with Eureka
This page is one run against one query. Ask Eureka your own question about stirred-tank bioreactor vessel design and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and the most-cited prior art
WO2012097079A2 — Linearly scalable single-use bioreactor system (Xcellerex, Inc.)
Discloses a single-use bioreactor bag design giving substantially equivalent maximum shear rate at the impeller tip and average bulk shear rate across a range of power-per-unit-working-volume and rpm values needed for bioculture processing. The system pairs two single-use bioreactor bags of different volumes where the ratio of working-volume height (H) to tank or bag diameter (D) is held at about 1, supporting scale-down and scale-up without re-deriving shear conditions.Filed 2012-07-19 by Xcellerex, Inc.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7384783B2 | Stirred-tank reactor system | 292 |
| 2 | US20050239199A1 | Stirred-tank reactor system | 253 |
| 3 | US20060199260A1 | Microbioreactor for continuous cell culture | 252 |
| 4 | US20050089993A1 | Apparatus and methods for simultaneous operation of miniaturized reactors | 213 |
| 5 | US20040077075A1 | Microfermentors for rapid screening and analysis of biochemical processes | 168 |
| 6 | US20090042253A1 | Use of perfusion to enhance production of fed-batch cell culture in bioreactors | 121 |
| 7 | US20180010082A1 | Bioreactor With Higher Agitation Rates | 79 |
| 8 | US7507579B2 | Apparatus and methods for simultaneous operation of miniaturized reactors | 53 |
| 9 | US7901934B2 | Probe connector assembly and method of use | 52 |
| 10 | WO2005104706A2 | Stirred-tank reactor system | 52 |
Citation counts favour older filings that have had more time to accumulate citations within the searched corpus — read them as a signal of influence, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three read-throughs from the concentration, trend and citation data, framed around where a new filing would actually land.
Vessel-design claim space is already staked by a small group
Half of all records in scope belong to just five assignees, and three-quarters belong to ten. A new entrant filing broad tank-geometry or working-volume claims is filing into ground that is already dense; differentiation has to come from a specific sub-feature, not a general vessel-design claim.
Activity has pulled back from its 2021-2023 run
Filings peaked at 15 in 2023 after building through the late 2010s, then fell from 7 (2021) to 2 (2024). That decline predates the publication lag window, so it is a real signal rather than an artefact of incomplete recent data — though 2025-26 figures should still be read as provisional.
The oldest stirred-tank system patents anchor the citation graph
The five most-cited records are all early filings describing core stirred-tank and microbioreactor apparatus rather than vessel-specific refinements like port layout or drainability. Heavy citation to these foundational documents means later filers are building around, not over, the base architecture.
Agitation-mechanism claims are the exception, not the rule
Most records classed here address vessel geometry, working-volume or port design rather than the stirring mechanism itself. That leaves impeller and agitation-specific claims comparatively open relative to the density seen in pure vessel-geometry claims.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to stirred-tank bioreactor vessel design, with the prior art for and against each one.
Who is filing, and where momentum has gone quiet
The ranking covers 77 companies across the 184 records in scope — not a top-50 or top-100 cut, but the entire ranked field the dataset returns.
One filer sits well ahead of the field
The leading assignee holds 23 of the 184 records, roughly a quarter more than the fifth-place filer's 16. The gap between first and fifth is real but not a runaway lead, which is consistent with a field where several established bioprocessing equipment makers hold overlapping vessel-design portfolios.
A long tail behind the top 10
Beyond the top 10 assignees, who together hold 77.7% of all records, the remaining filers each hold small counts. That pattern is typical of equipment categories where large bioprocess suppliers file broadly while smaller labs and contract manufacturers file narrowly around a single design tweak.
Several established filers show no latest-year activity
A number of assignees with substantial historical filings, including large single-use bioreactor and contract-manufacturing names, show zero filings in the latest year captured. Given the publication lag, this should be read as a pause visible in the data rather than confirmed withdrawal from the space.
| Assignee | Recent year | YoY |
|---|---|---|
| Baxter International Inc. | 0 | — |
| Baxter Healthcare Corporation | 0 | — |
| Lonza Walkersville, Inc. | 0 | — |
| Lonza Cologne AG | 0 | — |
| HyClone Laboratories, Inc. | 0 | — |
| Octane Biotech Inc. | 0 | — |
| Omnibrx Biotechnologies Private Limited | 0 | -100% |
| PHC Biosystems Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to specific next questions for R&D and IP teams working on vessel design.
Map the white space claims directly
The under-claimed branches above are starting points, not conclusions — a freedom-to-operate check against the specific claim language in the top-10 assignees' portfolios is the next step before drafting.
Explore white space in EurekaTrack the assignees that have gone quiet
Zero latest-year activity from previously active filers is worth monitoring rather than assuming permanent, given the publication lag on recent filings.
Set up assignee monitoring in EurekaPressure-test WO2012097079A2's scope
Its H/D-ratio-of-1 claim is central to scale-linear single-use bag design; understanding its actual claim boundaries matters before committing to a similar geometry.
Run a claim-scope check in EurekaCommon questions on stirred-tank bioreactor vessel design patents
The leading assignee in this 184-record dataset holds 23 records, with the top 5 assignees combined holding 92 records (50.0% of the field) and the top 10 holding 143 (77.7%). That concentration means a small group of established bioprocessing equipment makers controls most of the documented vessel-design claim space. Beyond the top 10, filing counts drop off quickly into a long tail of single- or few-filing entrants, so competitive risk is concentrated rather than evenly spread.
Filings peaked at 15 in 2023 after building through the late 2010s, then declined — from 7 in 2021 to 2 in 2024, a -71% change over that span. 2024 is the most recent year that can be read as reasonably complete; 2025 and 2026 figures are still filling in because publication typically lags filing by around 18 months. Read the recent pullback as a real signal but treat the very latest years cautiously.
Relative to the dense core cluster around general vessel geometry and working-volume claims, areas like drainability and dead-leg minimisation, headspace-to-working-volume ratio control, surface finish specification tied to cleaning validation, and port layout for single-use bag integration show thinner filing density. These are not confirmed gaps without a dedicated freedom-to-operate search, but the composition data suggests they are less crowded than core tank-geometry claims.
WO2012097079A2, filed by Xcellerex, Inc. in 2012, covers a single-use bioreactor bag design that maintains consistent shear rate at the impeller tip and in the bulk fluid across a range of power-per-volume and rpm settings, paired with a scalable system using two bags of different volumes held at a working-volume height-to-diameter ratio of about 1. It is a foundational filing for linearly scalable single-use bioreactor systems, and its H/D-ratio claim is relevant to anyone designing scale-down or scale-up bag geometries using a similar shear-uniformity approach.
C12M (bioreactors and enzyme apparatus) is present in 98.9% of the 184 records, as expected given the search scope, making it the anchor class. C12N (microorganisms and genetic engineering) appears in 27.7% of records and B01F (mixing and stirring) in 16.8%, with smaller but relevant shares in C07K, C12Q, B01L, G01N and A23L depending on whether the vessel is being claimed for cell culture, protein production or food-grade fermentation applications.
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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.