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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/incineration-fly-ash-detoxification-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Solid Waste TreatmentIncineration Fly Ash Detoxification Patents
- Concentrated but not locked up. the leading assignee holds 32 records, yet the top 5 combined account for only 16.3% of the 569 records in scope — a long tail files the rest.
- Filing kept climbing through 2024. activity rose 42% from 53 records in 2021 to 75 in 2024, the last year the data can treat as complete.
- Solid waste disposal dominates the claim map. B09B covers 52.7% of records, more than double the next-largest class, C04B cement and refractories at 23.6%.
569
Published Records
16%
Top-5 Share of All Records
+42%
Filing Growth 2021→2024
CN
Leading Jurisdiction
Filing growth compares 2021 (53 records) with 2024 (75) — 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 569 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This dataset tracks patent filings addressing incineration fly ash detoxification — the treatment routes used to neutralise heavy metals and dioxins in fly ash from municipal and industrial waste incineration before disposal or reuse. It spans 569 published records filed between 2015 and mid-2026, covering water washing, chelating-agent stabilisation, heavy-metal leaching control, low-temperature pyrolysis, dioxin degradation and cement solidification approaches.
Filing is heavily weighted toward China, which accounts for 436 of the tracked receiving-office filings, with the United States, Japan, Europe, Singapore and Australia making up smaller shares. That concentration reflects where large-scale municipal incineration capacity has been built out fastest, and where fly ash disposal rules have tightened enough to push detoxification claims into the patent system.
Filing activity and technology composition, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Incineration Fly Ash Detoxification covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Data
Filing trend and technology composition
Two views of the same 569 records: how filing activity has moved year over year, and which IPC subclasses carry the claims.
Filing trend: steady build to a 2022 peak
Annual filings rose from 15 in 2017 to a peak of 76 in 2022, then held at a high plateau — 53 in 2021 climbing to 75 by 2024, a 42% increase over that span. 2025 and 2026 figures are undercounted because publication typically lags filing by around 18 months; they should not be read as a decline.
Technology composition: waste disposal and cement dominate
B09B (solid waste disposal) appears in 52.7% of the 569 records, making it the default classification for this field. C04B (cement, ceramics and refractories) follows at 23.6%, reflecting how much of the art routes detoxified ash into solidified or ceramic-bound end products rather than treating it as a standalone waste stream. Water treatment (C02F), chemical detox (A62D) and separation processes (B01D) each cover meaningfully smaller shares, and alkali/alkaline-earth compound classes (C01D, C01F) point to a real but narrower body of art on chemical transformation of the ash itself.
Shares are the percentage of the 569 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Incineration Fly Ash Detoxification covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Most-cited records and a recent filing
Representative recent filing
US12678726B2 — Method for clean and low-carbon in-situ disposal of waste incineration fly ash
ZHEJIANG UNIVERSITY
A system and method for clean and low-carbon in-situ disposal of waste incineration fly ash includes a waste incineration system and a fly ash disposal system. The fly ash disposal system includes a water washing system, an MVR system, and a dioxin removal system. The water washing system includes a water washing device and a press filtering device. The dioxin removal system includes a heating device, an activated carbon adsorption device, and a heat pump system. The MVR system includes a crystallizer, a heater, a vapor compressor, and other equipment. The waste incineration system is coupled with the fly ash disposal system nearby to achieve in-situ disposal of fly ash, avoiding the logistics of off-site transport.Filed by Zhejiang University, published 2026-07-14 — one of the most recent records in scope.
Most-cited records in the searched corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN101972766A | 一种垃圾焚烧飞灰固化/稳定化处理方法 | 54 |
| 2 | CN105964652A | 一种针对垃圾焚烧飞灰的固化稳定化处理方法 | 35 |
| 3 | CN105498146A | 焚烧飞灰双组分重金属稳定剂及其飞灰处理方法 | 34 |
| 4 | CN105712733A | 一种由垃圾焚烧飞灰和生物质热解气化残渣制备的多孔生物陶粒及其制备方法 | 34 |
| 5 | US20200399182A1 | Method of making waterproof magnesium oxychloride refractory brick by fly ash from municipal solid waste inci… | 30 |
| 6 | CN108295414A | 一种垃圾焚烧飞灰固化螯合方法 | 29 |
| 7 | CN110935710A | 一种生活垃圾焚烧飞灰水洗脱盐处理系统、方法和应用 | 28 |
| 8 | CN107030093A | 一种结合水洗和等离子体熔融处理焚烧飞灰系统 | 28 |
| 9 | JP2009229146A | Method and device for determining proper addition amount of fixing agent for fixing heavy metal in incinerati… | 27 |
| 10 | CN203494879U | 一种生活垃圾焚烧飞灰稳定化处理系统 | 23 |
Citation counts favour older filings simply because they have had more time to accumulate citations; treat this table as a map of influential prior art, not of current filing activity.
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.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Incineration Fly Ash Detoxification covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three patterns in the data matter more than the raw counts on their own.
Concentration
16.3%
top 5 share of all 569 records
No single assignee controls the field
The leading assignee holds 32 records out of 569, and the top 5 combined still only reach 16.3% of all records in scope. That is a fragmented landscape by patent-concentration standards — useful for a new entrant, because no single portfolio forecloses the whole detoxification route, but it also means freedom-to-operate work has to check many smaller holders rather than a handful of majors.
Assignee ranking, 569 records
Growth
+42%
2021 → 2024 filing growth
Filing momentum is still building, not fading
Filings grew from 53 in 2021 to 75 in 2024, a 42% rise over three years, after an earlier peak of 76 in 2022. The apparent dip in 2025-2026 reflects publication lag rather than a real slowdown, since publication typically trails filing by around 18 months.
Filing trend, 2017-2026
Claim map
52.7%
records classified under B09B
Solid-waste disposal claims dominate; chemistry claims are thinner
Over half of all records sit in B09B (solid waste disposal), and nearly a quarter also touch C04B (cement and refractories) — often the same filing claiming both a disposal method and a solidified end product. Chemistry-specific classes like A62D (detox) and C01D/C01F (alkali and alkaline-earth compounds) cover meaningfully fewer records, suggesting the underlying chemical mechanisms are less densely claimed than the process and end-use framing.
IPC composition, 569 records
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to incineration fly ash detoxification, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Incineration Fly Ash Detoxification covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the activity sits
The ranking covers 100 companies counted in records — not a top-50 or top-100 cut, but the full set the data returns. Ten co-assignee pairs point to a small number of active collaborations rather than a dense partnership network.
Leader
32 records
leading assignee
One filer sits well ahead of the pack
The top-ranked assignee holds 32 records, roughly three times the fifth-placed filer's 10. That gap at the very top coexists with a long tail: most of the 100 ranked companies hold only a handful of records each.
Assignee ranking
Collaboration
10 pairs
co-assignee pairs identified
Collaboration is limited and mostly corporate-affiliate
The strongest co-filing relationship links two affiliated entities with 10 shared records; most other pairs — including a university-industry link between a research university and a renewable-energy operator — sit at 3-4 shared records. This is a field of largely independent filers rather than joint-venture-driven patenting.
Co-assignee pairs, strongest links
Momentum
-100% YoY
several leading filers at zero in the latest year
Recent-year activity has gone quiet even among established filers
Several previously active assignees show zero filings in the latest tracked year, with year-on-year drops as steep as -80% and -100%. Given the 18-month publication lag, some of this is data catching up rather than firms exiting the space, but it is worth confirming directly before reading it as abandonment.
Recent-year momentum by assignee
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Zhejiang University | 1 | -80% |
| EasyMining Sweden AB | 0 | — |
| Engro Corporation | 0 | — |
| Suzhou Institute of Technology | 0 | — |
| University of Science and Technology Beijing | 0 | -100% |
| Mitsui E&S Shipbuilding Co., Ltd. | 0 | — |
| AGC Inc. | 0 | — |
| Zhejiang Jinglan Environmental Protection Technology Co., Ltd. | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Incineration Fly Ash Detoxification covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to a field that is still filling in rather than settling — three directions worth following up.
Check freedom-to-operate against the fragmented leader set
With the top 5 assignees holding only 16.3% of records, a meaningful FTO review has to look past the obvious leaders into the long tail of single- and double-digit filers.
Run an FTO search in Eureka →Watch whether 2025-2026 filings confirm the growth trend
The 42% rise from 2021 to 2024 is the most recent complete-year signal; publication lag means the next 12-18 months of data will show whether that pace held.
Set a filing alert in Eureka →Map the under-claimed chemistry classes in detail
B01J, C01D and C01F cover fewer records than the disposal and cement classes — worth a targeted search before assuming the chemical-transformation routes are crowded.
Explore the IPC breakdown in Eureka →Source: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Incineration Fly Ash Detoxification covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on this landscape
The leading assignee in this dataset holds 32 of the 569 records in scope, roughly three times the fifth-placed filer's 10 records. But concentration is low overall: the top 5 assignees combined account for only 16.3% of all records, so no single company controls the field. A practical search should look well beyond the top-ranked names into the long tail of smaller filers, many of whom hold only one or two records.
Yes, based on the most recent complete years of data. Filings rose from 53 in 2021 to 75 in 2024, a 42% increase, after an earlier peak of 76 in 2022. Figures for 2025 and 2026 look lower, but that reflects the roughly 18-month lag between filing and publication rather than an actual slowdown, so those years should not yet be read as a decline.
Over half of the 569 records, 52.7%, are classified under B09B, solid waste disposal, making it the dominant category. Cement, ceramics and refractories (C04B) follow at 23.6%, reflecting how often detoxified fly ash is claimed as a solidified or ceramic-bound product rather than a treated waste stream alone. Smaller but still substantial shares cover water treatment, chemical detoxification, separation processes, and alkali or alkaline-earth compound chemistry — the last two point to a narrower but real body of art on transforming the ash chemically.
China dominates receiving-office activity with 436 filings in this dataset, far ahead of the United States at 38, Japan at 18, Europe at 12, Singapore at 8 and Australia at 6. That distribution tracks where large-scale municipal solid waste incineration capacity has expanded fastest and where fly ash disposal regulation has tightened enough to drive patenting. Anyone filing outside China in this space is operating in a comparatively thin prior-art environment by volume, though not necessarily by quality.
The technology composition data shows chemistry-specific classes such as B01J (catalytic processes), C01D and C01F (alkali and alkaline-earth compound chemistry) carrying meaningfully fewer records than the dominant disposal and cement classes. That suggests routes built around catalytic detox, chelating-agent formulation chemistry, and alkaline-earth compound recovery from ash are less densely claimed than solidification or general disposal methods. It is not proof the space is empty, but it is a reasonable starting point for a novelty search before committing to a filing strategy elsewhere.
Answers are grounded in the same dataset. Derived from a Patsnap search on Incineration Fly Ash Detoxification covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.