Incineration Fly Ash Patents: Top Companies & Filing Trends 2026
- Concentrated but not locked up. the ranked leader holds 15 records and the top 5 combine for just 15.9% of all 345 records in scope — no single assignee controls the field.
- China dominates the filing venue. 290 of the tracked records were filed there, dwarfing Japan's 31 and the United States' 7, which matters for where enforcement and freedom-to-operate risk actually sits.
- Solidification still outweighs detox chemistry. B09B solid waste disposal appears on 44.6% of records versus 26.4% for A62D chemical detoxification, showing where filing effort has concentrated so far.
Filing growth compares 2021 (25 records) with 2024 (28) — 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 345 records in scope (CR5), not by the ranked leaders only.
What this patent set covers
Incineration fly ash from municipal solid waste carries leachable lead, cadmium and chlorides that must be immobilised before disposal or reuse. This landscape tracks 345 published records filed between 2015 and the 2026 data cut-off that claim chelating agents, cement solidification, chloride-removal steps or long-term leaching-stability testing against that ash. Publication lags filing by roughly 18 months, so the most recent filing years in the trend understate actual activity.
The scope spans mechanical, chemical and thermal routes: cement or geopolymer solidification, chelating-agent detoxification, metal extraction and recovery, and separation steps that pre-treat the ash before stabilization. Reading the IPC mix alongside the assignee ranking shows which of these routes are already dense with prior art and which still have room for a differentiated first claim.
Filing trend and technology composition
Two views of the same 345-record set: how filing activity has moved year over year, and how those records split across the IPC subclasses that define the technical routes.
Filing trend, 2017–2026
Filings ran from 19 in 2017 to a peak of 45 in 2022, with 2021 to 2024 — the last year treatable as complete — up 12% from 25 to 28 records. Years after 2024 are still filling in as publications catch up, so treat 2025 and 2026 figures as provisional rather than a slowdown.
Technology composition by IPC subclass
B09B (solid waste disposal) appears on 44.6% of the 345 records, followed by A62D (chemical detoxification) at 26.4% and C04B (cement and ceramics) at 17.1%. Because a single record can carry several IPC codes, these shares add up to more than 100% and should be read against the 345-record total, not against each other.
Shares are the percentage of the 345 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Incineration Fly Ash Heavy Metal Stabilization with Eureka
This page is one run against one query. Ask Eureka your own question about incineration fly ash heavy metal stabilization and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this dataset
Co-disposal pollution control method for municipal solid waste and membrane-concentrate-leached fly ash
Filed by the Chinese Research Academy of Environmental Sciences, this method heat-treats a mixture of membrane-concentrate-leached fly ash and municipal solid waste at 800-1100°C to produce a residue with reduced leaching toxicity, addressing the disposal problem created when membrane concentrate is used to leach incineration ash.Abstract condensed from the original filing for readability.
| # | 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 | CN102513329A | 一种城市垃圾焚烧飞灰无害化处置方法 | 46 |
| 3 | CN106282585A | 一种生活垃圾焚烧飞灰的脱毒分级资源化利用方法 | 45 |
| 4 | CN105964652A | 一种针对垃圾焚烧飞灰的固化稳定化处理方法 | 35 |
| 5 | CN101885584A | 一种垃圾焚烧飞灰电熔处理方法 | 31 |
| 6 | CN108295414A | 一种垃圾焚烧飞灰固化螯合方法 | 29 |
| 7 | JP2009229146A | Method and device for determining proper addition amount of fixing agent for fixing heavy metal in incinerati… | 27 |
| 8 | CN107477597A | 一种垃圾焚烧飞灰稳定无害化处理的方法 | 25 |
| 9 | CN203494879U | 一种生活垃圾焚烧飞灰稳定化处理系统 | 23 |
| 10 | CN101474468A | 一种使用螯合剂处理焚烧飞灰的方法 | 23 |
Citation counts inside this corpus favour older filings — treat them as a measure of influence on later filers, not 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.
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Three patterns stand out once filing volume, technology mix and citation weight are read together.
No single owner controls the field
The leading assignee holds 15 records and the top 5 combined account for 15.9% of all 345 records in scope. That is enough to show a research core forming around a handful of Chinese institutes, but far short of the concentration that would signal a blocking position.
Solidification leads detox chemistry
Solid waste disposal claims (B09B) sit on 44.6% of records, well ahead of chemical detoxification (A62D) at 26.4%. Cement and ceramics-route claims (C04B) trail further at 17.1%, suggesting stabilization-by-encapsulation has drawn more filing effort than additive-based detoxification.
Filing venue is heavily domestic
China accounts for 290 of the tracked records, compared with 31 in Japan and 7 in the United States. Freedom-to-operate exposure for anyone commercialising outside China is currently thin, but that also means Chinese filings are the ones worth watching for near-term enforcement risk.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to incineration fly ash heavy metal stabilization, with the prior art for and against each one.
Assignee landscape
The ranking covers 100 companies and research institutes returned by the data endpoint — not a curated top-50 or top-100 list, but the full ranked set the dataset produces.
A Chinese research-institute core
Filing activity clusters around Chinese environmental science academies and universities rather than equipment manufacturers, with the strongest co-assignee pairings running between a national research academy and regional transport or environmental engineering institutes.
Fragmented below the top 10
Filing counts drop quickly outside the top 10 — from 15 at the leader to 7 at tenth place — pointing to a long tail of single- or few-filing entrants rather than a small set of dominant portfolios.
Recent-year activity has thinned
Several previously active assignees, including major Chinese universities and environmental groups, show zero filings in the latest tracked year, with one institute down 100% year-on-year. This likely reflects publication lag rather than a real pullback from the field.
| Assignee | Recent year | YoY |
|---|---|---|
| South China Institute of Environmental Sciences, Ministry of Ecology and Environment | 1 | — |
| Chinese Research Academy of Environmental Sciences | 0 | — |
| University of Science and Technology Beijing | 0 | -100% |
| Chongqing Yuqian Expressway Co., Ltd. | 0 | — |
| Chongqing Sanfeng Environmental Industry Group Co., Ltd. | 0 | — |
| Zhejiang University | 0 | — |
| China Merchants Chongqing Communications Research & Design Institute Co., Ltd. | 0 | — |
| Suzhou Institute of Technology | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio planning or identifying a filing gap.
Check freedom-to-operate against the dense classes
B09B and A62D carry the heaviest claim density in this set. Any new solidification or chelating-agent method should be checked against records in those two subclasses before filing.
Run a clearance search in EurekaTrack the leading Chinese institutes
The strongest co-assignee pairs and the top-ranked filer are concentrated among a small group of Chinese research academies. Watching their newest publications is the fastest way to catch emerging claim scope early.
Set up assignee monitoring in EurekaScope a first claim in the thinner branches
Metal recovery from stabilized residue and chloride pre-washing show lower filing density than the core solidification routes, leaving room for a narrower, well-drafted first claim.
Draft a claim scope in EurekaCommon questions on this landscape
The ranked leader holds 15 of the 345 records in scope, with the top 5 assignees combining for 15.9% of all records. That concentration is meaningful but not dominant: it points to a research core, largely made up of Chinese environmental science institutes and universities, rather than a single company controlling the field. Anyone assessing risk should also look at the long tail below the top 10, since filing counts drop quickly from 15 at the leader to 7 at tenth place.
Cement and solid-waste-disposal solidification claims are more heavily represented: B09B appears on 44.6% of the 345 records versus 26.4% for A62D, the chemical detoxification and chelating-agent class. C04B, the cement and ceramics subclass specifically, sits at 17.1%. This suggests encapsulation-style solidification has drawn more filing effort historically than additive-based chemical detoxification, though both routes are active.
The thinner IPC subclasses relative to the two leading ones — separation processes (B01D) and water treatment (C02F), both at 8.1% of records, and catalysis-based approaches (B01J) at 5.2% — carry less filing density than solidification or chelation claims. Chloride pre-washing steps, chelating-agent recovery and reuse, and metal recovery from stabilized residue are specific branches worth scoping before assuming the space is occupied.
China accounts for 290 of the 345 tracked records, compared with 31 in Japan and 7 in the United States. This reflects both the scale of municipal solid waste incineration capacity built in China over the past decade and the concentration of research funding at national environmental science academies, which file domestically first. It does not mean the underlying technology is only relevant in China — it means freedom-to-operate and prior-art risk is currently weighted toward Chinese filings.
Filing activity rose from 19 records in 2017 to a peak of 45 in 2022, and the 2021-to-2024 span, the last period treatable as complete, was up 12% from 25 to 28 records. Publication typically lags filing by around 18 months, so the lower counts shown for 2025 and 2026 reflect records still working through publication rather than an actual drop in filing activity. Any read of a slowdown based on the newest one or two years would be premature.
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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.