Electrospun Nanofiber Patents: Leaders, Trends & White Space 2026
A data-led review of 722 electrospun nanofiber patent families: filing trends since 2015, the assignee concentration at the top, IPC composition across spinning, nonwoven and biomedical classes, and where claim space rem
Filing growth = 2021 (61 records) → 2024 (30); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 722 records in scope (CR5), not the ranked leaders only.
What the electrospun nanofiber patent record shows
Electrospun nanofiber patenting spans fibre-formation mechanics and the downstream materials built from them. The 722 records in scope classify overwhelmingly under D01D (man-made filament spinning) and D04H (nonwovens and felts), confirming that most claim activity is still anchored in how the fibre is spun and assembled rather than in any single end application. A meaningful minority reach into A61L sterilising, B01D separation and A61K medicinal preparations, showing biomedical and filtration use cases layered on top of the core spinning art.
Filing rose through the late 2010s, peaked in 2019, and has fallen since — a genuine decline through 2024, the last year with a complete publication record. Assignee concentration is modest: a single leader with 43 families sits well ahead of the field, but the top ten combined still account for less than a third of all records, leaving considerable room for new entrants to stake claims in less-crowded branches.
Filing trend and technology composition
Two views of the same 722-record dataset: how filing activity has moved year over year, and how records distribute across the IPC subclasses that define the field's core technical branches.
A 2019 peak followed by a real decline
Annual filings ran from 50 in 2017 to a peak of 74 in 2019, then eased back; the 2021-to-2024 span alone shows a 51% drop, from 61 records to 30. 2025 and 2026 figures are still filling in under normal publication lag and should not be read as a continuation of that slope yet.
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.
Spinning and nonwovens carry the claim volume
D01D and D04H each cover more than half of all 722 records, meaning most claims are still about fibre formation and web assembly. A61L, B01D, B32B, B29C and A61K each sit under a quarter of records, marking narrower but still active application branches in sterilisation, filtration, laminates, plastics shaping and medicinal use.
Shares are the percentage of the 722 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe most-cited and most representative filings
US10357939B2 — High performance light weight carbon fiber fabric-electrospun carbon nanofibers hybrid polymer composites
The disclosure covers hybrid polymer composites built from continuous carbon nanofiber sheets, a few hundred nanometers in diameter, developed from electrospun PAN nanofibers and sandwiched between carbon fibre fabric epoxy resin prepregs by compression molding, using a low content of carbon fibres.Filed by Council of Scientific and Industrial Research, published 2019-07-23.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6110590A | Synthetically spun silk nanofibers and a process for making the same | 415 |
| 2 | US20060094320A1 | Gradient nanofiber materials and methods for making same | 295 |
| 3 | US20120040581A1 | Template-supported method of forming patterns of nanofibers in the electrospinning process and uses of said n… | 179 |
| 4 | US20050079379A1 | Enhancement of barrier fabrics with breathable films and of face masks and filters with novel fluorochemical … | 176 |
| 5 | US20100009267A1 | Metal oxide fibers and nanofibers, method for making same, and uses thereof | 154 |
| 6 | US20100018641A1 | Methods of Applying Skin Wellness Agents to a Nonwoven Web Through Electrospinning Nanofibers | 153 |
| 7 | WO2006049664A1 | Composite nanofiber materials and methods for making same | 140 |
| 8 | WO2005090653A1 | A bottom-up electrospinning devices, and nanofibers prepared by using the same | 74 |
| 9 | WO2005073441A1 | A bottom-up electrospinning devices, and nanofibers prepared by using the same | 72 |
| 10 | US20080113214A1 | Luminescent device | 70 |
Citation counts accumulate over time and favour older records; treat them as a signal of influence on later filings, not of current commercial relevance.
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The ranking, the trend and the citation table point in the same direction: a shallow leadership tier, a large unconsolidated tail, and citation weight sitting on older filtration and fibre-forming patents rather than on recent work.
No single assignee controls the field
The leading assignee holds 43 families, well ahead of fifth place at 16, but the top five together still account for only 19.1% of all 722 records. That leaves most of the space open to filers who are not yet on the ranked list at all.
A real slowdown, not a lag artefact
Filing peaked in 2019 at 74 records and has fallen through every subsequent complete year. The three-year drop from 61 to 30 records is measured on years that have finished publishing, so it reflects an actual pullback in new filing rather than the usual under-count in the most recent years.
Fibre-formation claims dominate over application claims
D01D and D04H between them cover the majority of records, meaning the densest prior art sits in how the fibre is spun and how the web is assembled. Application-specific classes such as A61K medicinal preparations and B01D separation each sit under a quarter of records, leaving those use cases comparatively less crowded.
Influence sits on older filtration and spinning art
The most-cited record in the dataset, on synthetic silk nanofibers, carries 415 citations, and the next four most-cited records are all pre-2013 filings on gradient materials, templated patterning and barrier fabrics. New entrants should expect to design around this older foundational art even when targeting a modern application.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electrospun nanofiber patent landscape, with the prior art for and against each one.
Where to take this analysis
The dataset points to a fragmented field with a narrowing filing trend and dense prior art concentrated in fibre formation. The next steps depend on whether the goal is freedom-to-operate, licensing, or identifying a filing gap.
Map freedom-to-operate against the leading assignee's portfolio
With one assignee holding 43 of 722 families, any new filing in core spinning or nonwoven claims should be checked against that portfolio before drafting.
Run a freedom-to-operate check in EurekaProbe the under-claimed application branches
A61K, B29C and B32B each sit under 15% of records, suggesting claim space in medicinal, plastics-shaping and laminate applications of electrospun fibre that has not been heavily staked out.
Explore white space in EurekaTrack the post-2024 filing signal as it fills in
The 2025-2026 counts are still incomplete under normal publication lag; revisit the trend once those years mature to confirm whether the decline continues or reverses.
Set up a filing alert in EurekaCommon questions about electrospun nanofiber patents
The dataset ranks 100 assignees by patent family count, with the leading company holding 43 families and a wide gap down to the fifth-ranked entrant at 16. The top five combined hold only 19.1% of all 722 records in scope, and the top ten hold 29.5%, so leadership is concentrated at the very top but the field overall is not dominated by a small group. A long tail of companies and research institutions each hold only a handful of filings, which means competitive position depends heavily on which specific technical branch a company operates in rather than on overall filing volume.
No, filing has declined from its peak. Activity rose through the late 2010s to a peak of 74 records in 2019, then fell; from 2021 (61 records) to 2024 (30 records) filings dropped 51% over that three-year span. 2024 is the last year with a complete publication record, so this decline is a real trend rather than a gap caused by publication lag. Figures for 2025 and 2026 will still revise upward as later-filed applications publish, so it is too early to say whether the decline continues past 2024.
Claims cluster heavily around fibre formation itself: D01D (man-made filament spinning) covers 65.4% of the 722 records and D04H (nonwovens and felts) covers 56.1%, together forming the technical core of the field. Downstream application classes are smaller but active, including A61L sterilising and disinfecting at 23.3%, B01D separation processes at 14.5%, and A61K medicinal preparations at 11.5%. Because a single record can carry multiple IPC classes, these shares add up to more than 100%, and they show that most patent activity addresses how the fibre is made rather than any one specific end use.
US10357939B2 covers hybrid polymer composites built from continuous carbon nanofiber sheets, electrospun from PAN precursor and sandwiched between carbon fibre fabric epoxy resin prepregs using compression moulding, filed by the Council of Scientific and Industrial Research and published in 2019. It is a composite-structure and process claim rather than a claim over electrospinning generally, so it constrains that specific hybrid layup and moulding route rather than the broader field. Anyone working with electrospun carbon nanofiber sheets in structural composites should review its specific process and layer-sequence limitations before assuming freedom to operate, but it does not block electrospun nanofiber work outside that composite construction.
The application-specific IPC classes sit well below the fibre-formation classes: A61K medicinal preparations, B29C plastics shaping and B32B layered products each cover well under 15% of the 722 records, compared with 65.4% for core spinning claims. That gap suggests less-crowded claim space in specific medicinal formulations, plastics-shaping integration and laminate structures built on electrospun fibre, rather than in the fibre-spinning mechanics themselves, which carry the densest prior art and the most-cited historical patents. Filers looking for a defensible position are better served targeting a specific application layer than trying to claim broadly around the spinning process itself.
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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.