Asphalt Mixing Plant Patents: Who Leads, Where the Gaps Are 2026
- 44.0% of all 455 records sit with just five assignees, and the leader alone holds 74 — filing here is concentrated, not fragmented.
- Filings peaked in 2017 at 50 and the 2021→2024 comparison shows a 50% drop (14 to 7) among complete filing years.
- C08L polymer compositions appear in 67.0% of records, far outpacing E01C roads & pavements at 30.3% — the binder chemistry, not the plant hardware, carries most of the claim density.
Filing growth compares 2021 (14 records) with 2024 (7) — 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 455 records in scope (CR5), not by the ranked leaders only.
What the asphalt mixing plant patent record actually shows
The search covers 455 published records filed between 2015 and mid-2026 across combustion control, aggregate drying, reclaimed asphalt pavement (RAP) feed handling, dust filtration and hot storage silo claims. Filing activity peaked in 2017 at 50 records and has run lower since, though the most recent one to two years are understated because publication typically lags filing by roughly 18 months. The technology mix leans heavily toward binder and additive chemistry rather than plant mechanics: C08L polymer compositions touch two-thirds of records in scope.
Assignee concentration is pronounced at the very top of the ranking, then thins quickly into a long tail of single- or few-filing entrants. That combination — a dominant leader, a handful of well-filed followers, and 90+ names with modest counts — is typical of a mature process industry where a few players built early moats on dispersion and emulsion chemistry, and everyone else files narrowly around specific plant components.
Filing trends and technology composition
The figures below use the full 455-record scope. Class shares add to more than 100% because a single record commonly carries several IPC codes; treat the trend line's final years as provisional given publication lag.
Filing trend, 2017 peak to 2026
Filings peaked at 50 in 2017 and, among years that can be treated as complete, fell from 14 in 2021 to 7 in 2024 — a 50% decline over that span. 2025 and 2026 figures will continue to fill in as publications catch up with filing dates, so they should not be read as a continuation of that decline yet.
IPC technology composition
C08L (polymer compositions) appears in 67.0% of the 455 records, followed by E01C (roads & pavements) at 30.3% and C08K (polymer additives) at 26.6%. C04B (cement/refractories), C09D (coatings), C08J (polymer processing), C09J (adhesives) and B28C (mortar/concrete mixing) each account for a smaller but non-trivial slice, showing that plant-side mixing hardware (B28C at 5.5%) is claimed far less often than the materials that pass through it.
Shares are the percentage of the 455 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Asphalt Mixing Plants with Eureka
This page is one run against one query. Ask Eureka your own question about asphalt mixing plants and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this space
EP3776105B1 — Emission control for an asphalt mixing plant (Ammann Schweiz AG, 2022-05-04)
Filed under the German title covering emissions control of an asphalt mixing plant, this record represents the combustion- and emissions-management side of the field, distinct from the binder-chemistry cluster that dominates the most-cited list.Original title: "EMISSIONSSTEUERUNG EINER ASPHALTMISCHANLAGE"
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2007112335A2 | Water-in-oil bitumen dispersions and methods for producing paving compositions from the same | 156 |
| 2 | US20070082983A1 | Water-in-oil bituminous dispersions and methods for producing paving compositions from the same | 122 |
| 3 | US20080194738A1 | Water-In-Oil Bitumen Dispersion and Methods for Producing Paving Compositions from Same | 91 |
| 4 | US20070191514A1 | Bituminous paving composition and process for bituminous paving | 75 |
| 5 | US7297204B2 | Water-in-oil bituminous dispersions and methods for producing paving compositions from the same | 72 |
| 6 | US20070060676A1 | Bituminous paving composition and process for bituminous paving | 67 |
| 7 | US5943234A | Paving mixture design system | 66 |
| 8 | US20080041276A1 | Method for Re-Using Recycling Asphalts and the Production of Asphalt Aggregate | 59 |
| 9 | US4836857A | Asphalt additive compositions | 59 |
| 10 | US7811372B2 | Rejuvenating agent and process for recycling of asphalt | 58 |
Ranked by citation count within the searched corpus. Older records accumulate more citations by virtue of age, so this table signals influence on later filings rather than current commercial relevance.
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Browse MCP servers →What the numbers mean for a filing decision
Three patterns stand out once volume, concentration and technology mix are read together.
A narrow group holds nearly half the field
The leading assignee alone accounts for 74 records, and the top five combined reach 200 records — 44.0% of everything in scope. The top ten extend that to 66.6%. Anyone entering this space is filing against a small number of well-established portfolios, not a fragmented crowd.
Materials chemistry outweighs plant hardware
C08L polymer compositions and C08K additive claims together dominate the technology mix, while B28C mortar/concrete mixing sits at just 5.5%. Most of the claim density in this dataset is in what goes into the mix, not how the plant itself is built.
Volume has cooled from its 2017 peak
After peaking at 50 filings in 2017, activity among the leading assignees has slowed: recent-year momentum data shows several top filers at zero in the latest year, with year-over-year drops of -100% for some. The 2021-to-2024 window itself shows a 50% decline, though 2025-2026 figures are still incomplete.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to asphalt mixing plants, with the prior art for and against each one.
Who is filing, and where the field is still open
The 100-company ranking returned by the dataset is not a top-50 or top-100 cut — it is the complete ranking the endpoint returns. Reading it alongside the technology mix points to where the crowded and open areas actually sit.
One assignee holds a clear lead
The top-ranked assignee holds 74 of the 455 records in scope, well ahead of the fifth-place holder at 26 and tenth place at 17 — a steep drop-off rather than a gradual one.
A few tight collaboration clusters exist
Ten co-assignee pairs appear in the data, with the strongest pairing appearing together on 30 records. Most other pairings are far weaker, suggesting collaboration is the exception rather than the norm in this field.
A long tail of narrow filers
Beyond the top ten assignees — who together hold 66.6% of all records — the remaining ranked companies each hold small, often single-digit counts, typically around specific plant components rather than broad chemistry platforms.
| Assignee | Recent year | YoY |
|---|---|---|
| ALM Holding Co. | 0 | -100% |
| MeadWestvaco Corp. | 0 | — |
| Sasol Wax GmbH | 0 | — |
| Ergon Asphalt & Emulsions Inc. | 0 | -100% |
| Iowa State University Research Foundation Inc. | 0 | — |
| QUIMIKAO S A DE | 0 | — |
| The Lubrizol Corp. | 0 | — |
| Ceca SA | 0 | — |
Where to take this next
The dataset points to concentrated ownership of binder chemistry and thinner coverage of plant-control components. Two directions follow from that.
Map the plant-control white space in detail
B28C mixing, silo temperature control and burner sequencing show lower filing density than the polymer-chemistry classes. A focused search on those specific components, rather than the whole field, will show whether a clean first-claim position still exists.
Explore the technology in EurekaWatch the leading assignees for renewed activity
Several top filers show zero activity in the latest year, but publication lag means 2025-2026 filings have not fully surfaced yet. A watch on the leading portfolios will catch renewed filing before it shows up in a static report.
Set up assignee monitoring in EurekaCommon questions about asphalt mixing plant patents
One assignee leads clearly with 74 of the 455 records in scope, ahead of the fifth-ranked holder at 26 and the tenth-ranked at 17. The top five assignees together hold 44.0% of all records, and the top ten hold 66.6%, so ownership is concentrated at the top rather than spread evenly across the field. Beyond that group, the ranking extends to 100 companies with progressively smaller counts, many filing on just one or two records around specific plant components.
Filings peaked in 2017 at 50 records and have generally run lower since. Among years that can be treated as complete, filings fell from 14 in 2021 to 7 in 2024, a 50% decline over that span. The 2025 and 2026 figures are still incomplete because publication typically lags filing by around 18 months, so it is too early to call the very latest trend a continued decline rather than a reporting gap.
Polymer composition claims (IPC class C08L) appear in 67.0% of the 455 records in scope, making binder and additive chemistry the largest single technology cluster by a wide margin. Roads and pavements claims (E01C) follow at 30.3%, and polymer additive claims (C08K) at 26.6%. Mixing hardware itself, classified under B28C, appears in only 5.5% of records, indicating that most patent activity concerns what goes into the asphalt mix rather than the physical mixing equipment.
EP3776105B1, held by Ammann Schweiz AG and dated 2022-05-04, covers emissions control for an asphalt mixing plant. It represents the combustion- and emissions-management side of the field, which is a distinct cluster from the water-in-oil bitumen dispersion patents that dominate the most-cited list. Anyone designing burner or emissions-control systems for a mixing plant should review its specific claim scope before finalising a control architecture.
The technology composition data shows plant-control components — mixing temperature feedback, hot storage silo management, bag filter dust handling and burner sequencing — carry noticeably lower filing density than the dominant binder-chemistry classes. Because C08L and C08K claims absorb most of the activity, narrowly scoped process-control claims around specific components may face less crowded prior art. A targeted search on those specific sub-areas, rather than the field as a whole, is the way to confirm an open position before drafting.
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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.