Constructed Wetland Resource Recovery Patents: Early Movers 2026
- 18 families total, but filing is still accelerating — 2025 alone produced 5, more than any prior year.
- China and India file 9 and 8 respectively, Australia contributes just 1 — this is not yet a globally distributed filing pattern.
- Only 2 co-assignee pairs exist across the whole set, meaning almost every filer is working alone rather than in joint ventures.
A niche intersection still finding its shape
Constructed wetland resource recovery sits at the intersection of wastewater treatment and material recovery: instead of treating a wetland purely as a passive filter, these filings claim ways to harvest nutrients, biomass or metals from the system as a co-product. The dataset is small — 18 published families across an eleven-year window — but the shape of it is informative. Filing was effectively zero through 2017 and only reached 5 families in 2025, the peak year so far, which tells you this is a technology area still being defined rather than one with settled claim boundaries.
Because publication typically lags filing by around 18 months, the 2026 count of 3 is very likely an undercount of what has actually been filed; the true trajectory beyond 2025 will only become visible in later data pulls.
Filing trend and technology composition
Two views of the same 18 families: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
Growth is still accelerating, not plateauing
The midpoint year (2022) sits at 2 families against a 2025 peak of 5 — annual output more than doubled in the back half of the window, with no sign yet of a filing ceiling.
Overwhelmingly a water-treatment classification
All 18 records classify under C02F (water and wastewater treatment), with single-digit spillover into battery/fuel-cell classes (H01M), separation processes (B01D), catalysis (B01J), land reclamation (B09C), presses (B30B) and fertiliser classes (C05B, C05G) — evidence that resource-recovery claims are drafted primarily as treatment claims with recovery as a secondary limitation, not the reverse.
Shares are the percentage of the 18 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Constructed Wetland Resource Recovery with Eureka
This page is one run against one query. Ask Eureka your own question about constructed wetland resource recovery and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
Worm-based system for onsite domestic sewage source separation and waste resource recycling (AU2021105783A4)
Filed by Harbin Institute of Technology, this innovation patent combines a biomass solid waste collection device, a worm-based septic tank, a worm-based biological filter and a constructed wetland into one onsite treatment chain for villages and towns. The worm-based septic tank co-composts biomass solid waste with household black water, while the biological filter handles grey water separately before both streams route through the wetland stage.Granted as an Australian innovation patent rather than a standard patent — a faster but narrower form of protection.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN118637779A | 一种林业生态废水处理与资源回收一体化方法 | 6 |
| 2 | CN220887270U | 一种水解酸化-人工湿地-微生物燃料电池系统 | 3 |
| 3 | CN113979532A | 一种具有磷回收作用的原电池型人工湿地系统 | 2 |
| 4 | CN112939230A | 一种具有氮磷回收作用的人工湿地系统 | 2 |
| 5 | CN115477382A | 净水厂富铁污泥资源化利用的方法 | 1 |
| 6 | CN215667313U | 一种人工湿地微生物燃料电池污水处理装置 | 1 |
Citation counts in a corpus this size favour earlier filings and should be read as an influence signal, not a ranking of current commercial relevance.
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. Publication numbers are shown where the record carries one (6 of 6 rows); clicking a row searches Eureka by that number.
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Three patterns stand out once the 18 families are broken down by geography, timing and citation behaviour.
Two offices dominate, a third barely participates
China and India together account for 17 of the 18 published records. Australia's single record is the AU innovation-patent filing from Harbin Institute of Technology, filed there for jurisdictional reasons rather than reflecting local invention activity.
Growth accelerated in the back half of the window
Annual filing more than doubled between the 2022 midpoint and the 2025 peak, with zero filings as recently as 2017. This is a technology area that only started accumulating meaningful patent activity in the last few years.
Almost no joint filing
Only two co-assignee pairings appear in the entire dataset, each linked to a single family. The near-absence of joint ventures suggests most innovation here is happening inside single institutions — universities and engineering firms working independently rather than pooling IP.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to constructed wetland resource recovery, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Chongqing University | China Construction Third Engineering Bureau Second Construction Engineering Co., Ltd. | 1 |
| Xihu Ecological Environment (Hangzhou) Co., Ltd. | PowerChina Huadong Engineering Corporation Limited | 1 |
With only two co-assignee pairs across 18 families, most filers in this space are protecting work done entirely in-house.
Who is filing, and where the gaps sit
The assignee base is fragmented: research universities and regional engineering firms each hold small, single-digit filing counts, and recent-year momentum has gone flat across the named assignees tracked here.
Momentum has stalled among named filers
Every assignee tracked for recent-year momentum shows zero filings in the latest year, and Xihu Ecological Environment (Hangzhou) shows a -100% year-on-year change. The aggregate field growth seen in the trend data is therefore coming from filers outside this tracked group, not from repeat filing by known players.
Universities and regional engineering firms, not corporates
The assignee list leans toward research universities (Chongqing University, Harbin Institute of Technology, Shandong University, Tarim University) and regional engineering or design institutes rather than large multinational corporates, consistent with a technology still in the applied-research stage.
The rare pairings are construction-engineering tie-ups
Where co-assignment does occur, it pairs a university or environmental firm with a construction or hydropower engineering contractor — Chongqing University with a construction engineering company, and Xihu Ecological Environment with a hydropower survey and design institute — suggesting recovery IP is being built into implementation contracts rather than shared research programmes.
| Assignee | Recent year | YoY |
|---|---|---|
| Chongqing University | 0 | — |
| Huixian Bisen Forestry Planning Co., Ltd. | 0 | — |
| Xihu Ecological Environment (Hangzhou) Co., Ltd. | 0 | -100% |
| Suzhou Taihu Sino-French Environmental Technology Co., Ltd. | 0 | — |
| Council of Scientific and Industrial Research | 0 | — |
| Zhejiang Yuda Construction Co., Ltd. | 0 | — |
| Shandong University | 0 | — |
| Tarim University | 0 | — |
Where to look next
This landscape is small enough that a handful of new filings could shift its shape quickly. Two follow-ups are worth prioritising.
Track the 2025–2026 filing surge as it publishes
With 2025 already the peak year and 2026 data still incomplete due to publication lag, the next 12–18 months of disclosures will show whether the accelerating trend holds or was a one-year spike.
Monitor filing trend in EurekaWatch for corporate entrants
The assignee base is currently university- and engineering-firm-heavy with almost no joint filing; a shift toward corporate or multinational filers would signal the technology moving from applied research toward commercialisation.
Set an assignee alert in EurekaFrequently asked questions
The tracked dataset contains 18 published patent families filed between 2015 and mid-2026, classified under water and wastewater treatment (C02F) with nutrient recovery, biomass harvesting or resource recovery language in the title or claims. This is a genuinely small field compared with mainstream wastewater treatment patenting, and the count should be read as a snapshot rather than a ceiling, since recent years are undercounted due to publication lag. Most of the volume is concentrated in the last few years of the window rather than spread evenly across it.
China leads with 9 records and India follows closely with 8, together accounting for the large majority of the dataset. Australia contributes a single record, an innovation patent filed by a Chinese university rather than evidence of a distinct Australian research base. Filing activity has not yet spread into a globally distributed pattern, so applicants outside China and India currently face comparatively open claim space in most jurisdictions.
It is accelerating. The dataset shows zero filings in 2017, 2 families at the 2022 midpoint, and 5 families in 2025, the peak year recorded so far. Because publication lags actual filing by roughly 18 months, the 3 records shown for 2026 almost certainly understate real filing activity for that year, and the true 2025-2026 trend will only become clear once later disclosures publish.
AU2021105783A4, assigned to Harbin Institute of Technology, is an Australian innovation patent covering an onsite domestic sewage system for villages and towns that combines a biomass solid waste collection device, a worm-based septic tank, a worm-based biological filter and a constructed wetland. Its core mechanism is using worms to co-compost biomass solid waste together with household black water, with grey water routed separately through the biological filter before both streams reach the wetland stage. As an Australian innovation patent rather than a standard patent, its protection is narrower and faster-granted, and its practical blocking effect is strongest for worm-based pre-treatment front ends feeding into a wetland, not for wetland resource recovery mechanisms generally.
The IPC composition shows 18 of 18 records classified under C02F with only single-digit spillover into battery/fuel-cell (H01M), separation (B01D), catalysis (B01J), soil reclamation (B09C), mechanical pressing (B30B) and fertiliser classes (C05B, C05G). That spillover pattern points to under-claimed branches around microbial fuel cell integration with wetland substrates, fertiliser-grade output specifications for recovered nutrients, and mechanical biomass press-cake recovery — areas that appear in the classification data but have not yet attracted dense, competing claim sets.
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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.
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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.