High Pressure Grinding Rolls Patents: Who Leads, Where Gaps Are 2026
- One filer holds 177 of 239 records in scope, with the top five combined reaching 93.7% of all records — this field is about as concentrated as comminution patenting gets.
- Filing peaked in 2019 at 45 records, then fell from 25 in 2021 to 13 in 2024, a -48% move over that span (2025-26 figures are still filling in under publication lag).
- 94.1% of records sit in B02C (crushing & grinding), but smaller adjacent classes like B30B presses and C22C alloys show far fewer filings — signalling where claim space is thinner.
Filing growth compares 2021 (25 records) with 2024 (13) — 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 239 records in scope (CR5), not by the ranked leaders only.
What the High Pressure Grinding Rolls patent record shows
High pressure grinding rolls (HPGR) technology compresses ore between two counter-rotating rolls to induce microcracking ahead of downstream grinding, and the patent record tracked here spans 239 records published between 2015 and mid-2026. The search combines core HPGR terminology with specific mechanical and metallurgical concepts — specific pressing force, edge effect, flake formation, roll surface wear and roll gap — to isolate filings that engage with the operating physics of the process rather than comminution equipment generally.
Filing activity rose through the late 2010s, peaked in 2019, and has since pulled back through 2024, the last year with a reasonably complete publication record. Ownership of the space is tight: a handful of assignees account for nearly all records, and the technology composition is dominated by one IPC subclass, with wear-resistant materials and roll construction forming smaller but persistent adjacent clusters.
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Filing trends and technology composition
Two views of the same 239-record dataset: how filing volume has moved year over year, and how records distribute across IPC subclasses. Because a single record can carry more than one IPC class, the composition shares sum to more than 100%.
Filing trend: a 2019 peak followed by a pullback
Filings ran from 1 record in 2017 to a peak of 45 in 2019, then declined; the tracked complete-year comparison shows 25 filings in 2021 falling to 13 in 2024, a -48% move. Treat 2025 and 2026 as undercounted rather than as evidence of further decline, since publication typically lags filing by around 18 months.
IPC composition: heavily concentrated in B02C
B02C (crushing, grinding & pulverising) covers 94.1% of the 239 records in scope, confirming this dataset is squarely about the grinding mechanism itself. B30B (presses, 9.2%), C22C (alloys, 5.0%), B22F (powder metallurgy, 4.6%) and B23P (metal working, 4.6%) form a secondary layer tied to roll construction and wear-resistant surfacing, each covering under one in ten records.
Shares are the percentage of the 239 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on High Pressure Grinding Rolls with Eureka
This page is one run against one query. Ask Eureka your own question about high pressure grinding rolls and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative recent filing
Systems, methods, and storage media for optimization of high pressure grinding roller processing (WO2024182851A1)
This filing from IDOBA PTY LTD, published 2024-09-12, targets the operational side of HPGR use rather than the roll hardware itself. It monitors roller throughput and recycle ratio with proxy sensors during comminution, analyses that data against historical records to quantify low-grade rock self-selected for recycle, and generates justification for rejecting ore so that fresh feed capacity increases.A monitoring-and-optimisation approach layered on top of existing HPGR hardware, rather than a claim on roll construction or materials.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20110011965A1 | Reinforced Roll and Method of Making Same | 56 |
| 2 | WO2011008439A2 | Reinforced roll and method of making same | 51 |
| 3 | US8308096B2 | Reinforced roll and method of making same | 21 |
| 4 | US20130025813A1 | Reinforced roll and method of making same | 18 |
| 5 | US20130277478A1 | Roller crusher having at least one roller comprising a flange | 18 |
| 6 | WO2013156586A2 | Roller crusher having at least one roller comprising a flange | 15 |
| 7 | US20130025127A1 | Reinforced roll and method of making same | 14 |
| 8 | US20130026274A1 | Reinforced roll and method of making same | 11 |
| 9 | US20210170418A1 | A deflection distributor refitting kit for a roller crusher, a roller crusher and method for mounting such kit | 10 |
| 10 | EP2653229A1 | Roller crusher having at least one roller comprising a flange | 9 |
Citation counts favour older records simply because they have had more time to accumulate citations within the searched corpus; read them as a signal of influence on later filings, not as a ranking of current technical importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three findings from the dataset that matter more than the raw counts on their own.
The field is a near-monopoly on paper
With the leading assignee alone holding 177 of 239 records and the top five combined reaching 93.7% of all records in scope, new entrants are filing into a space where the core roll-construction and wear-surface claims are already staked out by a small group. Freedom-to-operate work here should start with that leader's portfolio, not a broad landscape scan.
Activity has cooled from its 2019 peak
Filing volume peaked at 45 records in 2019 and has fallen since, with the last complete comparison showing a 48% drop from 2021 to 2024. Recent-year momentum by assignee also shows the largest filers at zero in the latest tracked year, though that reads as much as a publication-lag artefact as a genuine pullback.
Claims cluster on the grinding mechanism, not the periphery
B02C dominates at 94.1% of records, while presses (B30B, 9.2%), alloys (C22C, 5.0%) and powder metallurgy (B22F, 4.6%) each cover under one in ten records. That gap between the core class and its neighbours is where roll-surface material science and press-integration claims remain comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to high pressure grinding rolls, with the prior art for and against each one.
Who holds the claims, and where the gaps sit
The assignee ranking returned by the dataset covers 18 companies, counted in records — this is the full ranking the data endpoint returns, not a top-50 or top-100 cut. Ownership drops off sharply after the leading few names, with the tenth-ranked assignee holding just 2 records.
One assignee dominates the roll-hardware claims
The leading assignee's 177 records dwarf the rest of the ranking; by the fifth position, count has fallen to 4 records, and by the tenth to 2. This is a portfolio built over years of continuation filings on roll construction and wear-resistant surfacing, concentrated with related affiliate entities under the same corporate family.
A thin tail of single- and few-filing entrants
Below the top handful, filers hold only a handful of records each, including university and research-institute entrants. These smaller players tend to file around specific wear-material or roll-surface treatments rather than contesting the core mechanical claims held by the leaders.
Co-assignment is rare and concentrated within one corporate family
Only 5 co-assignee pairs appear in the dataset at all, and the strongest pair — two affiliated entities within the leading corporate group — shares 8 records. Cross-company joint filings are effectively absent, suggesting this technology is developed in-house rather than through joint ventures.
| Assignee | Recent year | YoY |
|---|---|---|
| Metso Outotec USA Inc. | 0 | -100% |
| Metso Sweden AB | 0 | — |
| Metso Minerals Sweden | 0 | — |
| TDY Industries Inc. | 0 | — |
| Kennametal Inc. | 0 | — |
| Metso USA Inc. (Brookfield) | 0 | — |
| METSO USA INC BROOKFIELD | 0 | — |
| Northeastern University (China) | 0 | — |
Where to take this analysis
The dataset points to a few concrete next steps depending on whether the goal is freedom-to-operate, sourcing new claim space, or tracking a specific competitor.
Run a freedom-to-operate check against the leading assignee
With 93.7% of records held by five assignees, any new HPGR filing on roll construction or wear surfacing needs to be checked against the leading portfolio specifically, not just the field in general.
Search assignee portfolios in EurekaProbe the under-claimed sub-areas before drafting
Press-integration, proxy-sensor optimisation and specific wear-material formulations show thinner filing density than the core B02C cluster — worth a targeted prior-art pull before committing claim language.
Explore white space in EurekaTrack post-2024 filings as they publish
Because publication lags filing by roughly 18 months, 2025-26 activity is still incomplete in this dataset; set up ongoing monitoring rather than relying on a single snapshot.
Set up monitoring in EurekaCommon questions about HPGR patents
One assignee holds 177 of the 239 records in scope, and together the top five assignees account for 93.7% of all records. That level of concentration means most of the core roll-construction and wear-surface claims sit with a small group of related corporate entities rather than being spread across many independent filers. Anyone assessing freedom-to-operate in this space should start with that leading portfolio before broadening the search.
Filing peaked in 2019 at 45 records and has declined since, with the last reliable comparison showing a drop from 25 filings in 2021 to 13 in 2024, a 48% fall. However, patent publication typically lags actual filing by around 18 months, so 2025 and 2026 figures in any dataset are still incomplete and should not be read as confirming a continued slowdown. The safest read is that activity cooled off its 2019 peak through 2024, with the more recent trend still unresolved.
The dominant IPC class is B02C (crushing, grinding and pulverising), covering 94.1% of the 239 records in scope, which confirms most filings address the grinding mechanism directly. Smaller but recurring clusters appear in B30B (presses, 9.2%), C22C (alloys, 5.0%), B22F (powder metallurgy, 4.6%) and B23P (metal working, 4.6%), reflecting roll-surface material science and construction techniques. Because a single patent can carry multiple IPC codes, these shares add up to more than 100% of the record total.
The gap between the dominant B02C class and its much smaller neighbours — B30B presses, C22C alloys, B22F powder metallurgy — suggests roll-surface material formulations and press-integration approaches carry lower filing density than the core grinding-mechanism claims. Process-optimisation approaches, like sensor-based monitoring of roller throughput and recycle ratio, also represent a comparatively newer and less crowded angle. Any first claim in these areas should still be checked against the leading assignee's portfolio, since that group's filings can extend into adjacent construction and material claims even when they are not the majority of their portfolio.
WO2024182851A1, filed by IDOBA PTY LTD and published 2024-09-12, claims systems and methods for monitoring HPGR roller throughput and recycle ratio with proxy sensors, then using that data to justify rejecting low-grade ore and increase fresh-feed capacity. It is a process-optimisation and software/data claim layered on top of existing HPGR hardware, not a claim on roll construction, wear materials, or the physical grinding mechanism itself. A hardware developer building rolls or wear surfaces is unlikely to be blocked by it directly, but anyone building sensor-driven throughput optimisation software for HPGR circuits should review its claim scope closely.
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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.