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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/anti-corrosion-primer-systems-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Coatings & Surface TreatmentAnti-Corrosion Primer Systems Patents: Filing Trends and Who Still Holds the Ground
- Filing has cooled since a 2018 peak of 60 records, with the partial 2026 count sitting at just 3 — the claim space filled early and has not reopened.
- Several of the most active historical filers show zero filings in the latest year, including Akzo Nobel, PPG, BASF Coatings, Henkel, DuPont and Kansai Paint — a sign the core chemistry is settled, not abandoned.
- C09D dominates at 1,119 of 1,136 records, but B05D coating-process claims (333) and B32B layered-product claims (157) show where secondary protection is still being built out.
1,136
Published Records
18%
Top-5 Share of All Records
+35%
3-Yr Growth (lag-adjusted)
US
Leading Jurisdiction
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
Anti-corrosion primer systems sit at the intersection of coating chemistry and metal surface protection: zinc-rich formulations, silane adhesion promoters, epoxy and acrylic binder systems, and the surface-preparation steps that determine whether a coating actually bonds under salt-spray conditions. This dataset pulls 1,136 patent families published between 2015 and mid-2026 under a search built around anticorrosive primer, corrosion protection coating and primer coating terminology, cross-referenced against IPC classes covering coatings (C09D), corrosion prevention (C23F) and silicon-based coating compositions (C09D163).
The picture is one of a mature, densely claimed core with a long filing history rather than an emerging field. Most activity concentrates in a handful of chemistry and formulation classes, and the most-cited prior art in the corpus dates back decades — a strong signal that foundational claim space on binder chemistry and surface pretreatment was staked out early.
Filing activity and IPC composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Anti-Corrosion Primer Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Numbers
Filing trend and technology composition
Publication counts by year and by IPC subclass, drawn directly from the 1,136 families in this corpus. Recent-year figures are understated because publication lags filing by roughly 18 months.
A peak in 2018, then a decline
Filings ran at 53 in 2017, rose to a peak of 60 in 2018, sat at 37 by the 2022 midpoint, and have fallen to a partial count of 3 in 2026. This is a flat-to-declining trend line, consistent with a technology whose core formulations were claimed in the mid-2010s and have not needed re-filing at the same pace since.
C09D coatings dominate, B05D and B32B trail
C09D (coatings, paints and inks) accounts for 1,119 of 1,136 records — effectively the whole corpus. B05D (coating processes, 333), B32B (layered products, 157), and the polymer-chemistry classes C08G, C08L, C08K and C08J form a secondary tier describing how the primer is applied and formulated rather than what it is.
Shares are the percentage of the 1,136 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Anti-Corrosion Primer Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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The most-cited prior art and the newest filing
Representative recent filing
WO2026052474A1 — Anticorrosive primer coating composition
AKZO NOBEL COATINGS INTERNATIONAL B.V.
The invention relates to an anticorrosive primer coating composition and to a method of coating it onto a metallic surface, the anticorrosive coating composition comprising: from 15 to 45 wt% of bisphenol epoxy resin; from 7 to 25 wt% of curing agent; from 4 to 15 wt% of epoxy reactive diluent from 0.1 to 8 wt% of (alkoxysilyl)alkylamine; and no more than 15 wt% solvent.Filed by Akzo Nobel Coatings International B.V., published March 2026 — one of the very few 2026 filings in this corpus.
Most-cited records in this corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6432191B2 | Silane-based, coating compositions, coated articles obtained therefrom and methods of using same | 115 |
| 2 | US4980196A | Method of coating steel substrate using low temperature plasma processes and priming | 101 |
| 3 | US5866259A | Primer coating compositions containing carbamate-functional acrylic polymers | 95 |
| 4 | US20010032568A1 | Silane-based, coating compositions, coated articles obtained therefrom and methods of using same | 94 |
| 5 | US3661622A | Method of improving resistance to corrosion of metal surfaces and resultant article | 90 |
| 6 | US6114021A | Primed polymer films having improved adhesion characteristics and processes for making the films | 76 |
| 7 | US5401307A | High temperature-resistant corrosion protection coating on a component, in particular a gas turbine component | 76 |
| 8 | US4098749A | Anticorrosion primer coating composition | 68 |
| 9 | WO2002022745A1 | Primer coating of steel | 56 |
| 10 | US4101497A | Sealant-primer coating | 56 |
Citation counts favour older records simply because they have had longer to accumulate citations inside this searched corpus — treat this as a signal of influence on downstream filings, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Anti-Corrosion Primer Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the data says about this field
Four patterns stand out once filing counts, IPC composition and citation data are read together.
Filing Trend
60 → 3
peak (2018) to latest partial year (2026)
The core chemistry was claimed early
Filing peaked in 2018 and has declined steadily since, with the 2026 partial count at just 3 records. This pattern points to a field where zinc-rich, silane and epoxy primer formulations were substantially claimed by the mid-2010s.
Read against the 1,136-family total, this is a mature filing curve, not a growing one.
IPC Concentration
1,119 / 1,136
records classified under C09D
Coating composition claims crowd out everything else
Almost the entire corpus sits in C09D (coatings, paints and inks). Coating-process claims (B05D, 333 records) and layered-product claims (B32B, 157 records) are present but far smaller, meaning most protection has been sought on the formulation itself rather than on application method or laminate structure.
Application-method and multi-layer claims remain comparatively open relative to formulation claims.
Citation Age
90-115 citations
on the five most-cited records
Foundational prior art is decades old
The most-cited records in this corpus include silane-based coating compositions and plasma-primed steel substrate methods filed well before 2015. Their citation counts of 90 to 115 reflect decades of accumulated influence, not recent relevance.
New filers are building on — and designing around — chemistry that predates this dataset's window.
Assignee Momentum
0 in latest year
for six major historical filers
Established filers have gone quiet
Akzo Nobel, PPG, BASF Coatings, Henkel, DuPont and Kansai Paint each show zero filings in the latest year, with BASF Coatings recording a -100% year-on-year change. This does not mean these firms have exited the space; it means their formulation portfolios are largely settled and current effort has shifted elsewhere.
Watch for renewed filing activity from these names as a signal of new chemistry, not routine maintenance.
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to anti-corrosion primer systems, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Anti-Corrosion Primer Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who holds the claim space
Assignee activity in this corpus is concentrated among established coatings manufacturers, several of whom show no filings in the most recent year — a sign of a settled rather than contested field.
Co-Filing
21 shared filings
Honda + Nippon Bee Chemical
The strongest co-assignee pair spans automotive and coatings
Honda Motor and Nippon Bee Chemical share 21 filings, the strongest co-assignee link in the corpus of 10 identified pairs — consistent with OEM-supplier co-development of primer systems for vehicle body protection.
Kansai Paint appears in two of the next-strongest pairs, with Toyo Color and Toyo Ink, each at 6 shared filings.
Momentum
0 filings
latest year, six major assignees
Large incumbents have stopped filing, not stopped competing
Akzo Nobel, PPG, BASF Coatings, Henkel, DuPont and Kansai Paint all show zero filings in the latest year. Given the corpus's declining trend line since 2018, this looks like portfolio maturity rather than withdrawal from the market.
Track these names for re-entry signals tied to new binder or additive chemistry.
Geographic Filing
200 US · 190 EPO · 165 JP
top three receiving offices
Filing is concentrated across three mature markets
The United States, European Patent Office and Japan account for the largest shares of receiving-office activity, with China and WIPO PCT filings trailing. This distribution matches a technology commercialised primarily through established automotive and industrial coatings supply chains.
Canada's 77 filings are notable for a market of its size, likely reflecting infrastructure and automotive coatings demand.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Henkel AG & Co. KGaA | 0 | — |
| E.I. du Pont de Nemours and Company | 0 | — |
| Akzo Nobel N.V. | 0 | — |
| Kansai Paint Co., Ltd. | 0 | — |
| BASF Coatings GmbH | 0 | -100% |
| PPG Industries, Inc. | 0 | — |
| PPG Industries Ohio, Inc. | 0 | — |
| Akzo Nobel Coatings International B.V. | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Anti-Corrosion Primer Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The trends above describe where filing has been. Deciding where to file next — or where to challenge an existing claim — needs a closer read of individual claim scope.
Check freedom-to-operate on the under-claimed branches
Multi-layer laminate structures and application-process claims show thinner density than core formulation claims. A targeted search inside Patsnap Eureka can confirm whether that gap is real or an artefact of this search string.
Explore in EurekaWatch for re-filing from quiet incumbents
Six major assignees show zero filings in the latest year. A renewed filing from any of them would signal new chemistry worth tracking early.
Set up monitoringSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Anti-Corrosion Primer Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Frequently asked questions
The corpus shows established coatings manufacturers as the most active historical filers, including Akzo Nobel, PPG, BASF Coatings, Henkel, DuPont and Kansai Paint. Several of these firms show zero filings in the most recent year, which suggests their core formulation portfolios are largely settled rather than that they have left the market. Co-filing patterns also show automotive OEMs partnering directly with coatings suppliers, such as the 21 shared filings between Honda and Nippon Bee Chemical.
No — filing peaked at 60 records in 2018 and has declined since, with the midpoint year of 2022 at 37 and the partial 2026 count at just 3. Because publication typically lags filing by around 18 months, the most recent year understates true activity, but the multi-year trend from 2018 onward is clearly downward. This points to a mature field where the core chemistry was claimed earlier in the decade.
Coating composition claims under IPC class C09D dominate overwhelmingly, covering 1,119 of the 1,136 records in this corpus. Coating-process claims (B05D) and layered-product or laminate claims (B32B) form a much smaller secondary tier, at 333 and 157 records respectively. Polymer chemistry classes such as C08G, C08L, C08K and C08J appear as supporting classifications rather than standalone filing categories.
Application-process claims and multi-layer laminate structures show comparatively thin density relative to the crowded formulation space in C09D. Specific sub-areas worth checking include plasma-based surface pretreatment methods, low-VOC silane adhesion promoters, and additive-driven salt-spray performance tuning. These are not guaranteed gaps — they reflect where this dataset shows fewer records relative to the core — so a targeted freedom-to-operate search is still needed before filing.
WO2026052474A1, filed by Akzo Nobel Coatings International B.V. and published in March 2026, claims an anticorrosive primer coating composition built from 15-45 wt% bisphenol epoxy resin, 7-25 wt% curing agent, 4-15 wt% epoxy reactive diluent, and 0.1-8 wt% of an (alkoxysilyl)alkylamine, with no more than 15 wt% solvent. It is one of the very few 2026 filings in this corpus, making it a useful current reference point for where epoxy-silane primer formulation claims stand today. Anyone formulating in this compositional range should review its specific weight-percent boundaries closely.
Answers are grounded in the same dataset. Derived from a Patsnap search on Anti-Corrosion Primer Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.