Hazardous Waste Treatment Patents: Leaders & China Filing Trends 2026
- Filing peaked in 2020 at 11 records and has since gone flat to declining, with the 2022 midpoint sitting at just 1 — a field that surged and cooled rather than one still building.
- Incineration dominates the claim space F23G covers 75.0% of the 28 records in scope, while chemical detox under A62D sits at only 7.1% — the imbalance is the map of where the crowd is and isn't.
- The top of the ranking is thin the leading assignee holds 6 records and the top 5 combined account for just 39.3% of all 28 records — concentration exists but a long tail of single- and few-filing entrants fills most of the field.
What this landscape covers
This review covers 28 published records matching hazardous waste incineration, solidification/stabilization and related detox routes under IPC classes B09B3, F23G5 and A62D3. Every receiving office in scope is China, which means the dataset reads as a picture of Chinese domestic filing activity rather than global patent strategy. Patent families, not raw document counts, are used for the assignee ranking, which keeps continuation filings from inflating any single applicant’s position.
Filing activity is concentrated technically in rotary-kiln and plasma-assisted incineration, with secondary claim density around flue-gas and combustion-residue handling. Publication typically lags filing by around 18 months, so the most recent year in the trend line understates real filing activity and should be read as a floor, not a ceiling.
Filing trend and technology composition
The trend line and IPC breakdown below are drawn directly from the 28 records in scope and use the denominators given for each measure — record shares do not sum to 100% because a single filing can carry several IPC classes.
A 2020 peak followed by a flat-to-declining run
Annual filings rose from zero in 2017 to a peak of 11 in 2020, then fell back sharply; the 2022 midpoint of 1 record confirms the decline rather than a temporary dip. 2026 is only partially captured at the data cut-off, so its single record should not be read as a floor for the year.
Incineration hardware carries most of the claim weight
F23G (incinerators and waste burning) appears in 75.0% of the 28 records, far ahead of F23J flue and residue handling at 25.0% and B09B solid waste disposal and F23L air/draught supply, each at 17.9%. Chemical detox under A62D and furnace/kiln design under F27B each sit at 7.1%, marking the two thinnest bands of claim coverage in this set.
Shares are the percentage of the 28 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hazardous Waste Treatment and Disposal with Eureka
This page is one run against one query. Ask Eureka your own question about hazardous waste treatment and disposal and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
CN215523315U — Hazardous waste incineration disposal system
The utility model describes a hazardous waste incineration disposal system combining pretreatment and feeding with a rotary-kiln incineration line and a plasma treatment line, both feeding into a waste-heat boiler and flue-gas purification train. A secondary combustion chamber sits downstream of the kiln and plasma outlets, an SNCR unit is fitted on the waste-heat boiler for a first stage of NOx removal, and an SCR reaction tower in the gas purification system provides a second NOx removal stage, aimed at near-zero-pollution flue gas discharge.Filed by Pilson Environmental Protection Technology Co., Ltd., dated 2022-01-14.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN105817459A | 一种利用等离子技术处理危险废物焚烧炉渣的方法 | 20 |
| 2 | CN112254133A | 新型危险废物燃烧在线耦合等离子体熔融的一体化系统 | 11 |
| 3 | CN105149317A | 一种纳米零价铁去除危险废弃物焚烧飞灰中重金属的方法 | 9 |
| 4 | CN112361354A | 危废回转窑焚烧在线除焦装置 | 6 |
| 5 | CN113970104A | 一种轴式窑身进风的危险废物焚烧系统及危险废物焚烧方法 | 6 |
| 6 | CN116772213A | 一种危险废物回转窑焚烧系统结焦分析与优化方法 | 4 |
| 7 | CN215523303U | 等离子危险废物处理系统 | 4 |
| 8 | CN112361351A | 危废回转窑焚烧工艺 | 4 |
| 9 | CN113970105A | 一种基于扬料板进风的危险废物焚烧系统及危险废物焚烧方法 | 4 |
| 10 | CN112923377A | 一种回转窑焚烧和侧吹炉还原熔炼协同处理危废的工艺方法及其工艺装置 | 3 |
Citation counts inside a searched corpus favour older filings; treat them as a signal of past influence, 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 the ranking, trend and IPC composition are read together: the field is domestically concentrated, technically lopsided toward incineration hardware, and past its filing peak.
A single-jurisdiction dataset
Every record in scope has China as its receiving office. That makes this landscape a strong proxy for domestic Chinese hazardous-waste patenting activity, but it says nothing about filing behaviour in the US, EU or other major waste-treatment markets, and comparisons outside China should not be drawn from these figures.
Filing has cooled since 2020
The trend rose to a peak of 11 records in 2020 and fell to 1 by 2022, a flat-to-declining pattern rather than a technology still in a buildup phase. New entrants filing now are working in a space where the busiest period of claim-staking has already passed.
Incineration hardware crowds the field
F23G incinerator and burning claims cover three-quarters of the 28 records, while chemical detoxification under A62D and furnace/kiln design under F27B each sit at only 7.1%. The gap is a claim-density map: incineration hardware is heavily occupied territory, detox chemistry is comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hazardous waste treatment and disposal, with the prior art for and against each one.
Who is filing, and where the crowd thins out
The ranked list covers 27 companies counted in records — the complete set the data endpoint returns, not a top-50 or top-100 cut. The leader holds 6 records; by fifth place that has fallen to 1, and it stays at 1 through tenth place, which is the clearest sign of how quickly this field's filing activity thins out beyond the front of the ranking.
A leader, then a fast drop-off
The leading assignee holds 6 records against a fifth-place figure of just 1, and the top 5 combined account for 39.3% of all 28 records in scope. That is real concentration at the very top, but it is not a duopoly market — most of the ranked companies hold only a single filing.
Ten firms still leave four in ten records open
Even extending to the top 10 assignees only reaches 57.1% of the 28 records in scope, meaning close to half the field's filings sit outside the ten most active companies. Engineering teams should not assume the named leaders control the whole claim space.
Co-filing is rare and clustered
Only three co-assignee pairs appear in the dataset, and all three link back to the same corporate group's design and engineering entities. Cross-company joint filing is not a meaningful feature of this landscape; most records carry a single named assignee.
| Assignee | Recent year | YoY |
|---|---|---|
| MCC Changtian International Engineering Co., Ltd. | 0 | — |
| Xinzhongtian Environmental Protection Co., Ltd. | 0 | — |
| Fangchenggang Houwang Environmental Protection Technology Co., Ltd. | 0 | — |
| Suzhou Wuzhong District Solid Waste Treatment Co., Ltd. | 0 | — |
| Hunan Jinma Metallurgical Technology Development Co., Ltd. | 0 | — |
| Shenzhen Qianhai Dongjiang Ecological Environment Service Co., Ltd. | 0 | — |
| Shenzhen China General Nuclear Engineering Design Co., Ltd. | 0 | — |
| Pilson Innovation Technology Co., Ltd. | 0 | — |
Where to take this analysis
The figures above describe where filing has concentrated and where it has thinned out. Turning that into a filing or freedom-to-operate decision means going claim-by-claim on the records that sit closest to a planned design.
Map claims against a specific process route
IPC-level shares show where activity clusters, but a real freedom-to-operate view needs claim language compared against the specific kiln, plasma or detox configuration under consideration.
Explore this landscape in EurekaTrack the assignees still filing after 2020
With overall filing flat to declining since the 2020 peak, identifying which of the ranked assignees kept filing afterward is more informative than the historical leaderboard alone.
Run an assignee momentum check in EurekaCommon questions on hazardous waste treatment patents
In this dataset of 28 records, the leading assignee holds 6 records, but the ranking drops off quickly after that — fifth place holds only 1 record, and tenth place also holds 1. The top 5 assignees combined account for 39.3% of all 28 records, and the top 10 combined reach 57.1%. That means no single company or small group dominates the field; a long tail of companies with one or two filings each makes up the rest of the ranking, which covers 27 companies in total.
No. Filing rose from zero in 2017 to a peak of 11 records in 2020, then declined, with the 2022 midpoint at just 1 record. That flat-to-declining pattern suggests the busiest period of claim-staking in this technical area has already passed, at least within the Chinese filings that make up this dataset. Publication lag of roughly 18 months means the most recent year is undercounted, but it does not change the overall downward trajectory from the 2020 peak.
Chemical detoxification methods under IPC class A62D and furnace/kiln structural design under F27B are each present in only 7.1% of the 28 records in scope, the two thinnest categories measured. By comparison, incinerator and waste-burning hardware under F23G appears in 75.0% of records. That gap points to detox chemistry and kiln structural design as areas with comparatively open claim space relative to incineration hardware.
No — every one of the 28 records in this dataset has China as its receiving office. This is a picture of domestic Chinese patent filing activity in hazardous waste incineration, stabilization and related detox technology, not a global view. Anyone evaluating filing strategy in the US, EU or other jurisdictions should treat these findings as directional at best and seek a separately scoped search for those regions.
CN215523315U describes a hazardous waste incineration disposal system that combines a rotary-kiln line and a plasma treatment line feeding a shared waste-heat boiler, with staged NOx removal through an SNCR unit on the boiler and an SCR tower downstream. Its specific value is in that dual-route, dual-stage-NOx-removal configuration, not in rotary-kiln incineration or SCR/SNCR technology generally, which are widely used independently. A new design that uses only one of the two incineration routes, or a single NOx removal stage, sits outside the combination this filing describes, though a formal freedom-to-operate check against the full claim set is the only reliable way to confirm that.
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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.