Precipitated & Fumed Silica Patents: Leaders vs. Long Tail 2026
- Filing has already peaked. annual filings rose from 46 in 2017 to a high of 101 in 2022, then eased off — this is a mature, not a growing, claim space.
- Rubber reinforcement dominates the IPC mix. C08K (polymer additives) and C01B (inorganic compounds) each cover well over half of all records, with tyre-specific filings under B60C a distant but persistent third.
- The incumbent group has gone quiet. several of the historically active assignees show zero filings in the latest full year, with year-on-year drops of -100% recorded for more than one name.
Filing growth compares 2021 (50 records) with 2024 (40) — 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 2,290 records in scope (CR5), not by the ranked leaders only.
A mature filing space built on tyre-grade reinforcement chemistry
Precipitated and fumed silica patenting sits at the intersection of inorganic chemistry and polymer science: the search set spans C01B (the base synthesis chemistry), C08K and C08L (how the silica is used as a filler or additive inside a polymer compound), and C09C (surface treatment and pigment-grade processing). The heaviest single downstream application is the pneumatic tyre, visible in the B60C volume, where BET surface area and silanol chemistry directly govern rolling resistance and wet grip trade-offs.
Filing activity climbed through the late 2010s, peaked in 2022, and has since declined — a pattern consistent with a technology where the core reinforcement chemistry is well established and incremental improvement, rather than new synthesis routes, is what remains patentable. Because publication typically lags filing by around eighteen months, the last one or two years in any chart will understate true filing activity, but the multi-year downward drift from the 2022 peak is not an artefact of that lag.
Filing trend and technology composition
Two thousand two hundred and ninety patent families make up this landscape, filed across six major receiving offices and spread over eight IPC subclasses that trace the path from raw synthesis to finished rubber, coating and pharmaceutical-grade product.
Filings rose to a 2022 peak, then declined
Annual filings grew from 46 in 2017 to a peak of 101 in 2022. The years since show a pull-back rather than continued growth, and the flat-to-declining midpoint signal means new entrants are more likely to be defending a niche use than opening new synthesis ground.
Polymer additive and rubber-reinforcement codes lead
C08K (additives in polymers) and C01B (non-metallic elements and inorganic compounds) are the two largest subclasses, each covering well over half of all records, followed by C08L and C09C. B60C (pneumatic tyres) confirms that tyre tread reinforcement is the dominant commercial driver, while A61K, C09D and B01J mark smaller but real footholds in pharmaceutical excipients, coatings and catalysis.
Shares are the percentage of the 2,290 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Precipitated and Fumed Silica Manufacturing with Eureka
This page is one run against one query. Ask Eureka your own question about precipitated and fumed silica manufacturing and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art doing the most citation work
US20070208127A1 — Precipitated Silica (Evonik Degussa)
The representative record specifies a precipitated silica by a tight physiochemical envelope: BET surface area from 35 to 350 m²/g, a BET/CTAB surface area ratio of 0.8 to 1.1, and a pore volume of 1.6 to 3.4 ml/g, among other listed properties.Property-range claims of this kind are what most later filers have to design around, rather than the synthesis process itself.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | EP0735088A1 | Rubber composition suitable for treads containing aluminium doped precipitated silica | 907 |
| 2 | US4675346A | UV curable silicone rubber compositions | 314 |
| 3 | EP0520862A1 | Process for the preparation of precipitated silica, precipitated silicas thus obtained, and their use in the … | 286 |
| 4 | US4681750A | Preparation of amorphous, precipitated silica and siliceous filler-reinforced microporous polymeric separator | 203 |
| 5 | US6573324B1 | Tire with component comprised of rubber composition containing pre-hydrophobated silica aggregates | 170 |
| 6 | US3985704A | Methacrylate-butadiene-styrene graft polymers and process for their production | 161 |
| 7 | US5403570A | Dispersible silica particulates | 140 |
| 8 | US5708053A | Silica-filled rubber compositions and the processing thereof | 131 |
| 9 | US7255852B2 | Precipitated silica product, dentifrices containing same, and processes | 129 |
| 10 | EP0647591A1 | Precipitated silicas | 129 |
Citation counts inside a searched corpus favour older filings — read them as a signal of influence on later drafting, not as a ranking of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the numbers say about where to file next
Three patterns stand out once the raw counts are read against filing dates and IPC spread: a peaked trend, a concentrated technology core, and a citation record dominated by a small number of tyre-industry filings.
The growth phase is over
Filings nearly doubled from 2017 to the 2022 peak, then declined. A flat-to-declining midpoint at 2022 means the space is no longer in an expansion phase; new filings are more likely incremental refinements of BET surface area, silanol density or drying process than new routes to the material.
Two subclasses carry the landscape
C08K and C09C reinforcement and additive chemistry, layered onto the base C01B synthesis work, account for the bulk of filings. B60C tyre-specific claims sit downstream of both, showing that most patent value is captured where silica chemistry meets rubber compounding rather than in stand-alone synthesis.
One tyre-tread filing anchors the citation graph
The most-cited record in this set, on aluminium-doped precipitated silica for tyre treads, draws more than three times the citations of the next entry. That gap signals a foundational reference that later reinforcement-chemistry claims have had to cite or distinguish from.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to precipitated and fumed silica manufacturing, with the prior art for and against each one.
A landscape with quiet incumbents and a thin co-filing network
Only ten co-assignee pairs appear across the whole dataset, and the recent-year momentum figures show several long-standing names filing nothing at all in the latest full year — a pattern more consistent with a settled competitive set than an active race.
Historic filers have gone dark
More than one previously active assignee shows a drop to zero filings in the latest year, with year-on-year change recorded at -100%. Read alongside the post-2022 trend decline, this points to consolidation of claim positions rather than continued active prosecution.
Co-filing is rare and concentrated
The strongest co-assignee link in the dataset pairs one organisation with two individual named inventors at counts of 13 and 9, with a corporate-to-corporate pairing appearing only at a count of 5. Collaboration here is mostly internal inventor teams, not cross-company joint filing.
Filing is US- and Europe-led
The United States and the European Patent Office receive the largest share of filings, with WIPO PCT, India, Japan and Canada trailing behind. That ordering reflects where tyre and specialty-chemical manufacturers file first, not necessarily where the material is manufactured.
| Assignee | Recent year | YoY |
|---|---|---|
| Rhodia Operations | 2 | -33% |
| Evonik Operations GmbH | 0 | -100% |
| Degussa AG | 0 | — |
| Goodyear Tire & Rubber Company | 0 | -100% |
| Cabot Corporation | 0 | — |
| Rhone-Poulenc Chimie | 0 | — |
| PPG Industries Ohio, Inc. | 0 | — |
| Cabot Corporation | 0 | — |
Where to take this analysis
The dataset points to a mature core with specific thinner branches. The next steps depend on whether the goal is freedom-to-operate, a filing strategy, or competitive tracking.
Run a freedom-to-operate check against the property-range claims
BET surface area, BET/CTAB ratio and pore volume ranges recur across the most-cited filings. Any new formulation should be checked against these ranges specifically, not just against assignee names.
Explore claim scope in EurekaTrack the quiet incumbents for renewed activity
Several long-standing assignees show a drop to zero recent filings. A watch on these names will catch any resumed filing before it shows up in aggregate trend counts.
Set up assignee tracking in EurekaProbe the under-claimed branches before committing a filing budget
Pharmaceutical-grade aggregation control and catalysis-support surface treatment show thinner density than the tyre-reinforcement core. A targeted prior art search there will confirm how open the space really is.
Search white space in EurekaCommon questions about this landscape
The dataset shows a small group of specialty-chemical and tyre manufacturers holding the bulk of historic filings, with a long tail of single- or few-filing entrants behind them. Several of the historically largest filers show zero filings in the most recent full year, which suggests the current leaderboard reflects legacy filing strength built up before 2022 rather than ongoing activity. Anyone assessing 'who leads' today should weight recent-year momentum, not just cumulative counts, because the two tell different stories here.
No, not on the filing-count evidence: annual filings rose from 46 in 2017 to a peak of 101 in 2022 and have declined since. Publication lag of roughly eighteen months means the most recent one or two years will always look artificially low, but the multi-year decline from the 2022 peak predates that effect. Practically, this points to a technology where core synthesis and reinforcement chemistry are settled and remaining patent activity is incremental.
It claims a precipitated silica defined by a specific physiochemical envelope, including a BET surface area of 35 to 350 m2/g, a BET/CTAB surface area ratio of 0.8 to 1.1, and a pore volume of 1.6 to 3.4 ml/g. These are property-range claims rather than a single process step, which means they can read on multiple different manufacturing routes that happen to produce silica inside those ranges. Anyone designing a new grade should check their target specification against these ranges directly rather than assuming a different process automatically avoids the claim.
The IPC composition shows heavy concentration in C08K and C01B, covering polymer additive use and base inorganic synthesis, with tyre-specific B60C claims layered on top. Thinner branches sit in areas like pharmaceutical-grade particle aggregation control, catalysis-support surface treatment, and coating-grade dispersion stability, where filing and citation density is noticeably lower than the tyre-reinforcement core. These are not guaranteed-open spaces, but they warrant a targeted search before assuming the core claims block a specific application.
EP0735088A1, covering aluminium-doped precipitated silica for tyre treads, draws by far the highest citation count in this dataset. Citation counts inside a searched corpus naturally favour older records because they have had more years to accumulate citing references, so this reflects influence on how later reinforcement-chemistry claims were drafted rather than current commercial dominance. It is a useful starting point for a prior art search in tyre-grade reinforcement silica specifically, less so as a general indicator of what matters today.
Research Precipitated and Fumed Silica Manufacturing in depth with Eureka
Go past this page: query the whole precipitated and fumed silica manufacturing corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.