Electrospun Nanofiber Filtration Patents: Leaders & White Space 2026
- 70.2% of all 94 records sit with just five assignees, leaving a long tail of single- and double-filing entrants.
- B01D separation processes appear in 89.4% of records while adjacent classes like B03C magnetic/electrostatic separation (7.4%) and A61L sterilising (6.4%) stay thin.
- Filing peaked in 2020 at 6 records and the tracked 2021→2024 span shows a full -100% drop-off, though 2025-26 counts are still filling in from publication lag.
Filing growth compares 2021 (3 records) with 2024 (0) — 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 94 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Electrospun nanofiber filtration sits at the intersection of fibre spinning process control and filter media engineering. The search scope combines core electrospinning and nanofiber filtration-layer terms with the process variables that actually determine whether a layer performs in the field: fibre morphology, solution parameters, production rate, layer adhesion, pressure drop and aerosol penetration. That combination narrows the corpus to 94 published records rather than the much larger set of general electrospinning art.
The record set spans 2015 through the 2026 cut-off, with publication naturally lagging filing by roughly 18 months, so the last one to two years understate real activity. Coverage is dominated by industrial filter-media makers rather than academic labs, which shows up clearly once the assignee ranking is read alongside the IPC composition below.
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Filing trend and technology mix
Two views of the same 94 records: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
A 2020 peak, then a documented pullback
Filing rose from 2 records in 2017 to a peak of 6 in 2020, then the tracked window from 2021 (3 records) to 2024 (0 records) shows a full -100% swing. Because 2024 is the most recent year that can be treated as complete under the 18-month publication lag, this is the most reliable read of recent momentum; 2025 and 2026 figures will still fill in.
Separation processes dominate, sterilising and magnetic separation stay thin
B01D (separation processes, including filtration) appears in 89.4% of the 94 records, with D04H nonwovens and felts a distant second at 28.7%. A62B rescue and life-saving equipment (16.0%) and D01D man-made filament spinning (13.8%) show electrospun nanofiber filtration is claimed across wearable and respiratory contexts too, while A45D, A47L, B03C and A61L each sit at or below 8.5%, marking them as comparatively under-claimed adjacent branches.
Shares are the percentage of the 94 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Electrospun Nanofiber Filtration with Eureka
This page is one run against one query. Ask Eureka your own question about electrospun nanofiber filtration and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
Filter Having Melt-Blown and Electrospun Fibers (US20100181249A1)
A multi-layer filter media including at least one layer of melt-blown fiber filter media and at least one layer of electrospun nanofiber filter media is provided. The multi-layer filter media of the present invention is configured such that the at least one layer of the melt-blown fiber filter media is on the upstream and the at least one electrospun nanofiber filter media is positioned downstream of the at least one melt-blown fiber filter media.Filed by Clarcor Inc., published 2010-07-22 — cited 81 times within this corpus.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7008465B2 | Cleanable high efficiency filter media structure and applications for use | 352 |
| 2 | US20040255783A1 | Cleanable high efficiency filter media structure and applications for use | 264 |
| 3 | US20080110342A1 | Particle filter system incorporating nanofibers | 182 |
| 4 | US20100181249A1 | Filter Having Melt-Blown and Electrospun Fibers | 81 |
| 5 | US20110168647A1 | Modular Filter Elements for Use in a Filter-in-Filter Cartridge | 80 |
| 6 | US8172092B2 | Filter having melt-blown and electrospun fibers | 65 |
| 7 | US7691168B2 | Highly charged, charge stable nanofiber web | 64 |
| 8 | US7789930B2 | Particle filter system incorporating nanofibers | 60 |
| 9 | US20200254371A1 | Polyamide nanofiber nonwovens for filters | 57 |
| 10 | US20110168621A1 | Two stage fuel water separator and particulate filter | 43 |
Citation counts inside a searched corpus favour older filings — treat this as a signal of influence on the field, not of current commercial relevance.
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Browse MCP servers →What the concentration and composition mean for filing strategy
Reading the assignee ranking against the IPC composition points to where claim space is already crowded and where it is not.
The field is led, not fragmented
With a leader at 24 records and the fifth-place assignee at 8, the top five together account for 70.2% of all 94 records in scope. That is a steep drop from leader to fifth place, meaning most of the claim space around core electrospun filter-media structures is already staked by a small group of industrial filtration companies.
Claims cluster on the filter structure, not the mechanism
The overwhelming majority of records claim under B01D separation processes, the general filtration bucket. Classes that describe more specific separation mechanisms or sterilising functions, such as B03C and A61L, sit under 8%, suggesting most inventive effort here targets media structure and layering rather than novel separation physics.
Recent activity has cooled from the 2020 peak
Filing activity peaked at 6 records in 2020 and the tracked complete-year window from 2021 (3 records) to 2024 (0 records) shows the full pullback. Because publication lags filing, 2025 and 2026 counts should not yet be read as confirming or reversing that trend.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electrospun nanofiber filtration, with the prior art for and against each one.
Who holds the claims, and where the gate sits
A small set of industrial filtration manufacturers hold most of the ranked records, with named recent-year momentum showing zero new records from the tracked leaders in the latest year — consistent with the broader cooling shown in the trend data.
A single filtration manufacturer sets the pace
The leading assignee holds 24 of the 94 records in scope, well ahead of the fifth-place assignee at 8. That gap indicates a company that has built a defensive filing program around electrospun nanofiber filter media over multiple years rather than opportunistic single filings.
A defined second tier, then a long tail
Filing drops from 24 at the top to 8 by fifth place and to 2 by tenth place, across 28 ranked companies total. That shape — a leader, a mid-tier cluster, then many single- or double-filing entrants — is typical of a field where the core structural claims are settled but peripheral applications remain open to new entrants.
Filing strategy favours US, Europe and India
The United States leads receiving offices with 27 filings, followed by the EPO at 16 and India at 13, with WIPO PCT filings at 10 and Germany at 8. That spread suggests assignees are pursuing protection across major manufacturing and end-market jurisdictions rather than concentrating in a single regime.
| Assignee | Recent year | YoY |
|---|---|---|
| EMD Millipore Corp | 0 | — |
| Donaldson Co Inc | 0 | — |
| 3M Innovative Properties Co | 0 | — |
| Cummins Filtration IP Inc | 0 | — |
| Research Triangle Institute | 0 | — |
| Ascend Performance Materials Operations LLC | 0 | — |
| DuPont de Nemours Inc | 0 | — |
| DuPont Safety & Construction Inc | 0 | — |
Where to take this from here
The dataset points to a concentrated core and a thinner set of adjacent branches. The next steps depend on whether you are scoping freedom-to-operate or looking for open claim space.
Check freedom-to-operate against the top 5
With 70.2% of records held by five assignees, any new filing on core electrospun filter-media structure should be checked against their specific claims before drafting.
Run an FTO screenExplore the under-claimed branches
B03C, A61L, A45D and A47L each sit under 8.5% of records — worth a closer look for claim space that has not been staked by the leading filers.
Explore white spaceWatch for the 2025-26 data catching up
The documented -100% swing to 2024 predates the point where publication lag stops masking new filings; revisit the trend once later years settle.
Track filing trendsCommon questions on electrospun nanofiber filtration patents
The ranking covers 28 companies, and it is concentrated rather than flat: the leading assignee holds 24 of the 94 records in scope, and the top five together hold 70.2% of all records. By tenth place, individual counts have fallen to 2 records, and the top ten combined reach 94.7% of the corpus. This is a field where a handful of established industrial filtration manufacturers hold most of the structural claims, with a long tail of smaller filers behind them.
Filing activity peaked at 6 records in 2020, and the tracked complete-year window from 2021 (3 records) to 2024 (0 records) shows a full -100% drop-off. Because patent publication lags filing by roughly 18 months, 2025 and 2026 figures in any dataset are still incomplete and should not be read as confirming further decline. The most defensible reading, based on complete years only, is that filing activity cooled from its 2020 peak through 2024.
B01D, the general separation-processes class covering filtration, appears in 89.4% of the 94 records in scope, making it the dominant classification by a wide margin. D04H (nonwovens and felts) follows at 28.7%, with A62B (rescue and life-saving equipment) at 16.0% and D01D (man-made filament spinning) at 13.8% showing meaningful but smaller presence. Because records can carry multiple IPC codes, these percentages add up to more than 100%, and classes like B03C and A61L sitting near 7-8% mark comparatively under-claimed technical branches.
US20100181249A1, assigned to Clarcor Inc. and published in 2010, claims a multi-layer filter media that positions melt-blown fiber layers upstream and electrospun nanofiber layers downstream in a defined configuration. Within this corpus it is cited 81 times, making it one of the more influential structural filings on layer ordering in composite filter media. Anyone designing a multi-layer filter with that specific upstream/downstream melt-blown-to-electrospun arrangement should review its claim scope directly rather than assume the layering concept alone is open.
The clearest under-claimed branches by IPC share are B03C (magnetic/electrostatic separation, 7.4% of records), A61L (sterilising and disinfecting, 6.4%), and A45D and A47L (hairdressing equipment and cleaning appliances, 8.5% each) — all well behind the 89.4% dominance of core B01D filtration claims. These lower shares do not guarantee an open field, but they indicate that fewer of the 94 records have staked claims combining electrospun nanofiber media with those specific functions, which is where a differentiated first claim is more likely to clear prior art.
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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.