Melt Spinning Patents: Top Companies & Filing Trends 2026
- 34.0% concentration at the top. The five leading assignees together hold 1,075 of the 3,164 records in scope, and the top ten hold 46.8% — a field where a handful of incumbents already occupy the core claim territory.
- Filing has gone flat since 2021. Annual filings rose from 9 in 2017 to a peak of 40 in 2021, then eased toward the 2022 midpoint of 29 — a plateau, not a retreat, but not renewed growth either.
- D01F and D01D dominate the classification mix. 78.6% of records touch chemical filament/fibre features (D01F) and 65.5% touch man-made filament spinning (D01D), leaving smaller but real footprints in yarn finishing, texturing and nonwovens.
What the melt spinning and fiber extrusion patent record shows
Melt spinning and fiber extrusion patenting covers the mechanics of forming man-made filaments from molten or dissolved polymer: spinneret design, draw ratio control, quench air management, spin finish chemistry and take-up speed. The dataset in scope runs from 2015 through the 2026 cut-off and totals 3,164 published records, classified primarily under D01D, D01F and D02J. Filing activity is not evenly spread — a small group of assignees accounts for a disproportionate share of the record base, a pattern consistent with a processing technology where the core mechanical and thermal control methods were established early and later filings build on, rather than replace, that foundation.
Because publication typically lags filing by around 18 months, the most recent filing years in this dataset understate actual activity; treat 2025 and 2026 counts as provisional rather than a signal of a real slowdown.
Filing trend and classification mix
Two views of the same 3,164-record dataset: the annual filing count, and the IPC subclasses those records fall into. Since records can carry multiple IPC codes, the classification shares add up to more than 100% of the record total.
A decade of filing activity, now flattening
Annual filings climbed from 9 in 2017 to a peak of 40 in 2021, then settled near the 2022 midpoint of 29. That pattern reads as a maturing, well-claimed field rather than one still opening up new ground.
Where the classification weight sits
D01F (chemical filament and fibre features) and D01D (man-made filament spinning) between them account for the large majority of records, at 78.6% and 65.5% respectively. Yarn finishing (D02J, 12.9%), texturing (D02G, 11.3%) and nonwovens (D04H, 7.0%) form a thinner secondary layer, with plastics shaping and polymer composition classes each near 5%.
Shares are the percentage of the 3,164 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Melt Spinning and Fiber Extrusion with Eureka
This page is one run against one query. Ask Eureka your own question about melt spinning and fiber extrusion and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
US4933130A — Production of spin-finish-free drawn fibers
Process for producing spin-finish-free man-made fibers by melt spinning high polymers having a glass transition temperature above 100 degrees C, then drawing the filaments with preheater godets to a preset draw ratio. Rather than applying conventional spin finish before drawing, the filaments are impinged with a liquid that evaporates residuelessly during drawing, with the preheater godet temperature set at least 40 degrees C higher than in the conventional spin-finish process.Filed by Hoechst Aktiengesellschaft, granted 1990-06-12 — illustrates how early spin-finish and godet temperature control claims still frame downstream drawing processes.
View full filing| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5162074A | Method of making plural component fibers | 834 |
| 2 | US5466410A | Process of making multiple mono-component fiber | 755 |
| 3 | WO2001073173A1 | High tenacity, high modulus filament | 656 |
| 4 | US6713011B2 | Apparatus and methods for electrospinning polymeric fibers and membranes | 315 |
| 5 | US5762798A | Hollow fiber membranes and method of manufacture | 259 |
| 6 | US5296185A | Method for spinning a polybenzazole fiber | 239 |
| 7 | US20030032767A1 | High-strength polyester-amide fiber and process for producing the same | 233 |
| 8 | US5344297A | Apparatus for making profiled multi-component yarns | 230 |
| 9 | US6448359B1 | High tenacity, high modulus filament | 217 |
| 10 | US4405688A | Microporous hollow fiber and process and apparatus for preparing such fiber | 194 |
Citation counts reflect influence within the searched corpus and favor older filings; they are not a measure 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 classification mix are read together.
The core claim space is already occupied
With the five leading assignees holding 34.0% of all 3,164 records and the ten leading holding 46.8%, new entrants working on standard melt spinning mechanics are filing into dense prior art rather than open ground. Freedom-to-operate work here needs to start from the leaders' portfolios, not a general prior-art sweep.
Growth has plateaued, not accelerated
Filings rose from 9 in 2017 to 40 in 2021 before easing back toward the 2022 midpoint of 29. Recent-year momentum among several long-standing assignees shows no new filings in the latest year, though the 18-month publication lag means the true 2025-2026 picture is still forming.
Fibre feature claims outweigh spinning-process claims
D01F (chemical filament and fibre features) at 78.6% outpaces D01D (man-made filament spinning) at 65.5%, suggesting a large share of activity is aimed at fibre composition and property claims layered onto established spinning methods rather than novel spinning apparatus itself.
Collaboration is limited and concentrated within corporate families
Only ten co-assignee pairs appear in the dataset, and the strongest pairing links two related entities within one corporate group. Cross-company joint filing is rare in this field, which points to in-house development as the dominant model rather than shared R&D.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to melt spinning and fiber extrusion, with the prior art for and against each one.
Who holds the ground, and where the gate sits
The ranked assignee list spans 100 companies, but activity is heavily front-loaded: the leader alone holds 290 records, more than double the tenth-place holder's 67.
One assignee sets the pace
The leading assignee's 290 records sit well ahead of the field; fifth place holds 108 and tenth place 67, a steep drop-off that marks this as a leader-plus-long-tail structure rather than an evenly split field.
A broad base of smaller filers
Below the top ten, the ranking runs to 100 companies with progressively smaller counts, indicating steady participation from converters, fibre specialists and equipment makers alongside the large integrated producers.
Japan leads receiving offices, US and EPO follow
Japan accounts for 994 filings, ahead of the United States (551), the EPO (438), the United Kingdom (264), WIPO/PCT (144) and Canada (127) — a filing footprint centred on the historic fibre-producing economies.
| Assignee | Recent year | YoY |
|---|---|---|
| E.I. du Pont de Nemours and Company | 0 | — |
| Toray Industries, Inc. | 0 | — |
| Teijin Limited | 0 | — |
| Asahi Kasei Corporation | 0 | — |
| Toyobo Co., Ltd. | 0 | — |
| Imperial Chemical Industries Ltd. | 0 | — |
| Unitika Ltd. | 0 | — |
| Mitsubishi Rayon Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to a concentrated, mechanically mature field with a thinning filing trend. The next steps depend on whether the goal is freedom-to-operate, whitespace filing, or competitive tracking.
Run a freedom-to-operate check against the leaders
With 46.8% of records held by ten assignees, any new melt spinning or fibre-feature filing should be checked against those portfolios specifically, not just the general prior art.
Explore assignee portfolios in EurekaScope claims in the under-claimed branches
Sub-areas like quench air control, spin finish alternatives and denier uniformity sensing carry lower classification density than the core D01D/D01F claims and may offer more room to file.
Map white space in EurekaTrack momentum, not just historical share
Several long-standing leaders show no filings in the latest year; combined with the 18-month publication lag, this is worth monitoring rather than assuming as a trend reversal.
Set up monitoring in EurekaCommon questions about melt spinning and fiber extrusion patents
Patent activity in this field is concentrated: the leading assignee holds 290 records out of 3,164 in scope, and the five leading assignees together hold 34.0% of all records. The ten leading assignees hold 46.8%. This is a leader-plus-long-tail structure — a handful of large, historically established fibre producers account for a disproportionate share of filings, while the remaining 90 of the 100 ranked assignees hold progressively smaller counts. Anyone assessing competitive position should look at both the absolute leader and the steep drop-off after the top few names.
Filing activity rose from 9 records in 2017 to a peak of 40 in 2021, then eased back to around 29 by the 2022 midpoint, indicating a plateau rather than continued growth. Because publication typically lags filing by about 18 months, the most recent one to two years in any such dataset are undercounted, so a definitive read on 2025-2026 activity is not yet possible. On present evidence, though, the trend is flat to slightly declining rather than accelerating.
The bulk of records fall under D01F (chemical filament and fibre features, 78.6% of records) and D01D (man-made filament spinning, 65.5%), with secondary activity in yarn finishing (D02J, 12.9%), yarn texturing and crimping (D02G, 11.3%), and nonwovens (D04H, 7.0%). Smaller but consistent footprints also appear in plastics shaping (B29C) and polymer composition classes (C08G, C08L), each around 5%. Because a single record can carry several IPC codes, these shares add up to more than 100% of the 3,164-record total.
The classification mix suggests lower filing density in areas like quench air flow control, spin finish chemistry alternatives, denier uniformity sensing, and yarn texturing crimp control compared to the heavily claimed core spinning and fibre-feature classes. These are not guaranteed open ground, but they carry less classification weight than D01D and D01F and are worth a dedicated prior-art search before committing claim language. Electrospinning-adjacent apparatus claims, visible in the most-cited record set, are another area where activity looks comparatively thinner than core melt spinning.
US4933130A, assigned to Hoechst Aktiengesellschaft and granted in 1990, claims a melt spinning process for high-glass-transition-temperature polymers where filaments are drawn using preheater godets set at least 40 degrees C higher than conventional practice, with an evaporable liquid impingement replacing spin finish before drawing. Anyone designing a spin-finish-free drawing process using elevated preheater godet temperatures and residueless liquid impingement should check this claim scope closely, since it covers the specific temperature-offset mechanism rather than the general goal of eliminating spin finish. Alternative routes — different liquid chemistries, different heating mechanisms, or spin-finish reduction rather than elimination — sit outside its literal claim language.
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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.