Forward Osmosis Desalination Patent Landscape 2026
The forward osmosis desalination patent field reached its peak in 2019 and annual volume has since eased back, with the field now showing decline-stage characteristics. A small number of membrane specialists and water-technology firms dominate the corpus, with the United States as the primary filing jurisdiction.
Asahi Kasei leads a moderately concentrated field of membrane and water-treatment specialists
Asahi Kasei Corporation holds the top position in the applicant ranking, followed closely by Porifera Inc and Oasys Water Inc. The top five applicants together account for 26% of the hundred largest filers’ combined patent records, indicating moderate but meaningful concentration.
The gap between the top tier — Asahi Kasei, Porifera, and Oasys Water — and the second tier of academic institutions (Nanyang Technological University, Yale University) and smaller technology companies is visible but not extreme, suggesting the field has not yet consolidated around a single dominant platform owner.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Asahi Kasei Corporation | 72 | |
| 2 | Porifera Inc | 65 | |
| 3 | Oasys Water Inc | 51 | |
| 4 | Nanyang Technological University | 32 | |
| 5 | Hydration Systems LLC | 32 | |
| 6 | Yale University | 30 | |
| 7 | Forward Water Technologies Inc | 25 | |
| 8 | Trevi Systems Inc | 23 | |
| 9 | Kyowakiden Industry Co Ltd | 19 | |
| 10 | Toray Advanced Materials Korea Inc | 19 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Gradiant Corporation | 18 | |
| 12 | Industrial Technology Research Institute | 18 | |
| 13 | Benit M Co Ltd | 18 | |
| 14 | IDE Water Technologies Ltd | 16 | |
| 15 | Regents of the University of California | 16 | |
| 16 | JFE Engineering Corporation | 15 | |
| 17 | Toyobo MC Corporation | 15 | |
| 18 | National University of Singapore | 15 | |
| 19 | Fujifilm Corporation | 15 | |
| 20 | NRGTek Inc | 14 |
The leaders’ positions imply that membrane materials and module design remain the central battleground. Academic applicants such as Nanyang Technological University, Yale University, and the National University of Singapore signal that fundamental membrane science continues to generate protectable output alongside commercial R&D.
Patent publication typically lags filing by 18–24 months, so counts for 2024–2026 understate actual activity; the apparent sharp drop in those years should not be read as a steeper decline than the trend data support. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2019 and has eased; B01D separation and C02F water treatment dominate the technology mix
The filing trend chart tracks annual patent activity from 2017 onward, while the technology composition chart shows how IPC classes are distributed across the corpus. Together they reveal a field past its primary growth phase with a well-defined core technology focus.
Annual filing trend
Annual filings peaked in 2019 and have trended downward since; the 2023–2026 bars are subject to publication lag and will rise as pending applications publish. The net recent-window change is -38% versus the prior period, consistent with the field’s post-peak trajectory.
↗ Hover for values · click a bar to ask EurekaTechnology composition
B01D (separation processes including filtration) and C02F (water and wastewater treatment) together overwhelmingly dominate the IPC mix, confirming membrane fabrication and water treatment system design as the core technical areas. Secondary branches — including C25B (electrolytic production), F03G (miscellaneous motors), A23L (foods and beverages), and C01D (alkali-metal compounds) — each hold a small share, pointing to application diversification into draw-solution chemistry and energy-recovery subsystems.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Systems and methods of draw solution recovery with…
Systems and methods for processing seawater, other brine sources, and/or mixed brine, to extract high purity sodium chloride and various sparingly soluble salts are disclosed. Example systems and methods may include (1) feeding the brine stream and one or more antiscalants into various combinations of nanofiltration, reverse osmosis, and osmotically… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Osmotic desalinization process | 217 |
| 2 | Thin film membranes with additives for forward and… | 153 |
| 3 | Systems and methods for forward osmosis fluid puri… | 117 |
| 4 | A forward osmosis membrane | 109 |
| 5 | Thin film composite membranes for forward osmosis,… | 101 |
| 6 | Water Flooding Method | 85 |
| 7 | Forward osmosis separation processes | 72 |
| 8 | Forward osmosis pressurized device and process for… | 71 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
The combination of post-peak filing volume, moderate concentration, active academic co-filing, and strong US-centric jurisdiction coverage shapes the strategic context for any entrant or incumbent evaluating forward osmosis desalination.
Decline stage: annual volume has eased from the 2019 peak
The field is classified as Decline, with annual filings easing back from their 2019 peak and a recent-window growth rate of –38%. This suggests the primary wave of speculative and foundational filing has passed. New entrants should expect a landscape where white space in core membrane design is shrinking, making application-specific or draw-solution chemistry angles more attractive.
Post-peak · 2019 peakTop five hold 26% of the hundred largest filers’ records — moderate, not locked up
The top five applicants — Asahi Kasei, Porifera, Oasys Water, Nanyang Technological University, and Hydration Systems — account for 26% of the top 100 filers’ combined patent records. The field is concentrated enough that key IP positions exist but not so dominant that entry is structurally blocked. A focused portfolio in adjacent chemistry or system integration could establish a credible position.
Moderate concentrationFive active co-filing pairs identified; industry–academia links are central
The most active co-filing pairs are Hydration Systems with Blue Cube IP (5 joint records), Forward Water Technologies with Queen’s University (5 joint records), and Asahi Kasei with Kobe University (4 joint records). Yale University and Cornell University account for 2 joint records. These pairings confirm that membrane material development frequently bridges commercial firms and research universities, a pattern that new entrants could replicate through targeted academic partnerships.
Industry–academia linksUS-centric filing with meaningful EPO, China, and PCT coverage
The United States leads as the primary filing jurisdiction, followed by EPO (Europe), China, and WIPO PCT filings. South Korea, Australia, Canada, and India each register meaningful coverage, consistent with active desalination markets. Israel and Singapore — both significant water-technology hubs — also appear. Notably, the Middle East’s water-scarce economies are underrepresented in the filing geography relative to their strategic need, which may reflect licensing rather than direct filing strategies by incumbents.
US-led · global reachGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Hydration Systems LLC | Blue Cube IP LLC | 5 |
| Forward Water Technologies Inc | Queen’s University | 5 |
| Asahi Kasei Corporation | Kobe University | 4 |
| Yale University | Cornell University | 2 |
| Hydration Systems LLC | Dow Global Technologies LLC | 1 |
| Toyobo Co Ltd | Sustainable Water Power Consultants FZ LLC | 1 |
| Toyobo Co Ltd | ARABIAN JAPANESE MEMBRANE CO LLC | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Asahi Kasei leads on membrane structure; Porifera is the most active recent challenger
The top two applicants differ in both technical emphasis and recent filing trajectory. Asahi Kasei has the largest overall record count but shows a declining recent trend, while Porifera is classified as a new entrant by recent filing activity.
Asahi Kasei Corporation
Asahi Kasei holds 72 patent records — the largest count in the ranking — with technical focus concentrated in B01D 61 (membrane separation processes), B01D 69 (membrane structures), and B01D 71 (membrane materials), signalling deep investment in membrane engineering fundamentals. Its collaboration with Kobe University (4 joint records) reinforces a material-science orientation. Recent filing momentum shows a ▼ –51% decline versus the prior period, indicating the company’s portfolio is maturing rather than expanding.
families: 72Porifera Inc
Porifera holds 65 patent records and is classified as a new entrant by recent filing activity (▲ new entrant trend), coming from a small prior-period base. Its technical emphasis spans C02F 1 (water and wastewater treatment), B01D 61 (separation processes), and notably C12G 3 (wine and fermented beverages) — the last indicating deliberate diversification of forward osmosis into food-and-beverage concentration applications. This breadth positions Porifera as a cross-sector applicant rather than a pure desalination specialist.
families: 65| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Asahi Kasei Corporation | 18 | ▼ -51% |
| Porifera Inc | 5 | ▲ new entrant |
| Forward Water Technologies Inc | 2 | ▲ new entrant |
| Trevi Systems Inc | 1 | ▲ new entrant |
Under-served adjacent branches in electrolytic draw-solution recovery and energy integration
The majority of forward osmosis IP is concentrated in B01D and C02F. Several adjacent branches show sparse coverage relative to their technical relevance, representing areas where early positioning could be differentiated.
C25B · Electrolytic draw-solution recovery
C25B (electrolytic production of compounds) registers only 47 patent records and a 2% share of the IPC mix. Draw-solution recovery — reconcentrating the osmotic agent after the forward osmosis step — is a recognized energy and cost bottleneck; electrolytic regeneration of ionic draw solutions is technically plausible but sparsely covered. An entrant with electrochemical engineering competence could establish early IP in this integration point, which sits at the boundary between the desalination core and energy subsystems.
Search this in Eureka →F03G · Osmotic pressure energy recovery and miscellaneous motors
F03G (spring, weight, and miscellaneous motors) holds 41 patent records at a 2% share, and in the context of forward osmosis this branch covers osmotic pressure-driven energy recovery devices. Pressure-retarded osmosis and salinity-gradient energy harvesting share physical infrastructure with desalination systems, yet the patent footprint here remains thin. Given growing interest in co-locating desalination with low-grade energy recovery, this branch merits watching; entry via system-integration patents that combine FO membranes with osmotic energy capture could create a defensible adjacent position.
Search this in Eureka →How leading applicants differ across membrane, water treatment, and application routes
Route coverage across the main technology branches in the current evidence set.
| Player | B01D 61 · Separation processes (filtration etc.) | C02F 1 · Water & wastewater treatment | C02F 103 · Water & wastewater treatment | B01D 69 · Separation processes (filtration etc.) | B01D 71 · Separation processes (filtration etc.) |
|---|---|---|---|---|---|
| Asahi Kasei Corporation | Strong · 72 | Absent | Absent | Strong · 59 | Strong · 54 |
| Oasys Water Inc | Strong · 54 | Strong · 55 | Absent | Moderate · 21 | Moderate · 17 |
| Porifera Inc | Strong · 49 | Strong · 50 | Absent | Absent | Absent |
| Hydration Systems LLC | Strong · 25 | Strong · 31 | Absent | Absent | Absent |
| Nanyang Technological University | Strong · 29 | Strong · 24 | Absent | Absent | Absent |
| Forward Water Technologies Inc | Strong · 25 | Strong · 24 | Absent | Absent | Absent |
Frequently asked questions
The corpus covers 545 patent families in scope. The United States is the leading filing jurisdiction by patent records, followed by EPO (Europe), China, and WIPO PCT filings.
Asahi Kasei Corporation leads with 72 patent records, ahead of Porifera Inc (65) and Oasys Water Inc (51). The top five applicants together hold 26% of the hundred largest filers’ combined records.
Annual filings peaked in 2019. Since then, volume has eased, and the recent-window growth rate is -38% versus the prior period. The field is classified as Decline-stage. Note that 2024–2026 counts are subject to publication lag and will rise as pending applications are published.
B01D (separation processes including filtration) and C02F (water and wastewater treatment) are by far the dominant IPC classes. Secondary branches — including C25B (electrolytic production), F03G (miscellaneous motors), A23L (foods and beverages), and C01D (alkali-metal compounds) — each hold small shares, reflecting diversification into draw-solution chemistry and energy-recovery subsystems.
The most active co-filing pairs are Hydration Systems with Blue Cube IP (5 joint records) and Forward Water Technologies with Queen’s University (5 joint records), followed by Asahi Kasei with Kobe University (4 joint records). The pattern shows that industry–academia partnerships are common, particularly around membrane material development.
C25B (electrolytic draw-solution recovery) and F03G (osmotic pressure energy recovery) each hold only about 2% of the IPC distribution despite having plausible technical relevance to draw-solution regeneration and osmotic energy harvesting. These branches represent sparse but technically adjacent areas relative to the dominant B01D and C02F core.
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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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