Carbon Fiber Precursor Patents: Leaders & Filing Trends 2026
- Filing has cooled since 2022, with the 2026 count still partial but tracking below the 994-filing peak recorded that year.
- No single filer dominates: the top 5 assignees together hold just 4.4% of the 17,257 records in scope, and the top 10 only 6.5%.
- Classification skews toward process chemistry, with water/wastewater treatment (C02F) and separation processes (B01D) outweighing battery-related filings (H01M).
What this landscape covers
This dataset tracks patent activity in carbon fiber precursor spinning and oxidation/carbonization line technology published between 2015 and mid-2026, spanning 17,257 records. It captures the core spinning-quality and exotherm-control claims that separate high-line-speed, low-energy production from legacy processes, alongside the large-tow and small-tow variants that determine downstream fiber cost and quality.
Filing offices are dominated by China, with the United States, Europe, WIPO/PCT filings, India and Japan trailing well behind, indicating that most active prosecution and defensive filing in this field is happening in and around Chinese manufacturing capacity.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trends and technology composition
Annual filings and IPC classification together show a field that grew steadily through the late 2010s, peaked in 2022, and has since pulled back — while the underlying classes reveal that process chemistry and separation technology carry more claim density than the battery end-use itself.
Filings rose from 847 in 2017 to a peak of 994 in 2022, then declined to 202 by 2026 (partial year)
Because publication typically lags filing by around 18 months, the 2025 and 2026 figures understate real filing activity; the decline from the 2022 peak is directional, not a hard stop.
C02F (water & wastewater treatment) leads at 23.4% of the 17,257 records in scope
B01D (separation processes) and B01J (catalysis) follow at 13.9% and 12.5% respectively, ahead of C01B (10.7%), C07C (9.1%), C22B (5.5%), C25B (5.0%) and H01M batteries at just 3.4% — since records can carry multiple classes, these shares add up to more than 100% of the record total.
Shares are the percentage of the 17,257 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Carbon Fiber Precursor and Oxidation Lines with Eureka
This page is one run against one query. Ask Eureka your own question about carbon fiber precursor and oxidation lines and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim and the most-cited prior art
Carbon fiber precursor fiber bundle, production method and production device therefor, and carbon fiber and production method therefor
The filing describes a precursor fiber bundle built from a controlled degree of intermingle between small tows, allowing easy bundling into one larger handling unit while retaining the ability to divide back into the original small tows spontaneously during firing. It targets the productivity gains of large-tow handling without sacrificing the fiber quality typically associated with small-tow lines.Abstract text truncated as supplied by the patent office; full claim language should be reviewed directly before relying on scope.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5545676A | Ternary photoinitiator system for addition polymerization | 1,067 |
| 2 | US6576349B2 | Heat treatable low-E coated articles and methods of making same | 579 |
| 3 | WO2006032282A1 | Method for treating biomass and organic waste with the purpose of generating desired biologically based produ… | 554 |
| 4 | US4366033A | Method for determining the concentration of sugar using an electrocatalytic sugar sensor | 470 |
| 5 | US4735632A | Coated abrasive binder containing ternary photoinitiator system | 377 |
| 6 | US20030205237A1 | Method of cleaning processing chamber of semiconductor processing apparatus | 315 |
| 7 | US6894128B2 | Catalyst composition, method of polymerization, and polymer therefrom | 309 |
| 8 | CN205833127U | 一种由环己烷制备环己酮的超高效氧化反应装置 | 271 |
| 9 | US6686050B2 | Heat treatable low-E coated articles and methods of making same | 270 |
| 10 | US5601607A | Implantable cardioverter defibrillator housing plated electrode | 254 |
Citation counts favour older records simply by virtue of having had more time to accumulate citations inside this searched corpus — treat them as a signal of influence within the dataset, not as a ranking of current technical importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the data means for filing strategy
Three patterns stand out once the raw counts are broken down: a flattening filing curve, a technology mix weighted toward process chemistry rather than the battery end-use, and a filer base with almost no concentration at the top.
The field has passed its filing peak
Annual filings rose from 847 in 2017 to a peak of 994 in 2022 before declining toward 202 in the partial 2026 count. Given the typical 18-month publication lag, the true 2025-2026 trend is softer than the raw numbers suggest, but the multi-year decline from 2022 is a real signal that filing intensity has cooled from its high point.
No single filer controls the field
The five most active assignees together account for only 4.4% of the 17,257 records in scope, and the ten most active for 6.5%. That leaves the large majority of filings spread across a long tail of research institutes, chemical producers and single-filing entrants, which means freedom-to-operate analysis has to look well beyond the named leaders.
Process chemistry outweighs the battery end-use
Water and wastewater treatment (C02F) and separation processes (B01D) together touch a larger share of records than battery and fuel-cell claims (H01M, 3.4%), pointing to a field where process-stream handling and byproduct treatment are more heavily claimed than the downstream application that motivates most of the R&D spend.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to carbon fiber precursor and oxidation lines, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| China Petroleum & Chemical Corporation (Sinopec) | Sinopec Research Institute of Petroleum Processing | 38 |
| China Petroleum & Chemical Corporation (Sinopec) | Sinopec Shanghai Research Institute of Petrochemical Technology | 30 |
| China Petroleum & Chemical Corporation (Sinopec) | Sinopec Fushun Research Institute of Petroleum and Petrochemicals | 25 |
| Institute of Process Engineering, Chinese Academy of Sciences | Beijing Zhongkai Hongde Technology Co., Ltd. | 21 |
| China Petroleum & Chemical Corporation (Sinopec) | Sinopec Nanjing Chemical Industries Research Institute Co., Ltd. | 17 |
| China Petroleum & Chemical Corporation (Sinopec) | Sinopec Beijing Research Institute of Chemical Industry | 17 |
| China Petroleum & Chemical Corporation (Sinopec) | Sinopec Qingdao Safety Engineering Institute | 16 |
| China Petroleum & Chemical Corporation (Sinopec) | Sinopec Safety Engineering Institute Co., Ltd. | 15 |
All ten identified co-assignee pairs link a parent chemical group to its own research institutes, rather than to outside partners — a pattern more consistent with internal R&D division than cross-company joint development.
Who is filing, and where momentum is shifting
The ranked leaders include large integrated chemical producers, specialist process-engineering institutes and a cluster of Chinese universities. Momentum among the most recently active filers is uniformly negative, with year-on-year filing counts down across every assignee tracked in the latest period.
A large integrated chemical producer sets the pace
The leading assignee's filing count sits well ahead of the rest of the field, but even at 254 records it represents a small fraction of the 17,257 total, underscoring how fragmented the broader filer base remains.
Academic and process-engineering institutes are close behind
Chinese universities and national process-engineering institutes occupy several of the top ten positions, reflecting continued state-linked research investment in precursor spinning and oxidation-line process control alongside commercial filers.
Recent-year filing activity is contracting across the board
Every tracked assignee with recent-year activity shows a year-on-year decline, ranging from a 33% drop to a full 100% drop to zero filings in the latest year. This is consistent with the broader post-2022 filing slowdown rather than any single company retreating from the field.
| Assignee | Recent year | YoY |
|---|---|---|
| Central South University | 3 | -73% |
| Beijing University of Technology | 2 | -80% |
| Zhejiang University | 2 | -33% |
| Institute of Process Engineering, Chinese Academy of Sciences | 1 | -67% |
| Kunming University of Science and Technology | 1 | -89% |
| China Petroleum & Chemical Corporation (Sinopec) | 0 | -100% |
| BASF SE | 0 | -100% |
| Casale SA | 0 | — |
Where to take this analysis
The published record set gives a picture of who has filed and where classification density sits today; turning that into a filing or freedom-to-operate decision requires drilling into specific claim families.
Map claims against the under-claimed branches
Cross-reference the gate chips above against your own process parameters to see whether a specific line-speed or exotherm-control approach still has open claim space.
Explore in EurekaTrack the leading filers' recent activity
Momentum data shows every tracked assignee pulling back in the latest year; watch for whether this reflects a genuine slowdown or a publication-lag artefact once 2025-2026 filings fully post.
Monitor assignees in EurekaCommon questions on this landscape
The ranked leader in this dataset holds 254 of the 17,257 records in scope, with the fifth-place assignee at 92 and the tenth-place assignee at 70. Even combined, the five most active assignees account for only 4.4% of all records, and the ten most active for 6.5%, so no single company dominates the field. The remaining filings are spread across a long tail of chemical producers, process-engineering institutes and universities.
Filing volume rose from 847 records in 2017 to a peak of 994 in 2022, then declined toward 202 by 2026, though the 2026 figure is a partial year. Because patent publication typically lags filing by around 18 months, the most recent one to two years in any such trend understate true activity. Taken together, the pattern points to a field that has passed its filing peak rather than one still accelerating.
The largest class by record count is C02F, water and wastewater treatment, covering 23.4% of the 17,257 records in scope, followed by B01D separation processes at 13.9% and B01J catalysis at 12.5%. Battery-related class H01M appears in only 3.4% of records, which is notable given how often carbon fiber is discussed in a battery or energy-storage context. Because a single record can carry multiple IPC classes, these shares add up to more than 100% and should not be read as a breakdown of the full record total.
Sub-areas such as oxidation exotherm feedback control, large-tow line-speed optimization and energy recovery in carbonization ovens carry comparatively thin claim coverage relative to the dense core process-chemistry classes. These branches sit adjacent to heavily filed territory rather than in an unrelated field, which is often where a workable first claim can still be built. Any freedom-to-operate check in these areas should still be run against the full ranked assignee list before relying on apparent gaps.
China leads by a wide margin with 9,294 filings recorded at its receiving office, followed by the United States at 2,026 and the European Patent Office at 1,349. WIPO PCT filings, India and Japan trail further behind. This distribution reflects where carbon fiber manufacturing capacity and associated process R&D are concentrated rather than where the underlying inventions necessarily originate.
Research Carbon Fiber Precursor and Oxidation Lines in depth with Eureka
Go past this page: query the whole carbon fiber precursor and oxidation lines corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.