Rock Wool & Mineral Wool Patents: Top Companies & Trends 2026
- Filing has cooled since its 2019 peak. 138 records that year against just 81 in 2017 and a flat-to-declining midpoint of 95 in 2022, with 2026 figures still partial.
- The top of the field is not a monopoly. The five leading assignees hold 22.3% of all 1,997 records and the ranked ten hold 30.1% — concentrated, but with a long tail of single-digit filers behind them.
- Building structures dominate the claim map. E04B accounts for 21.0% of records, well ahead of layered products (B32B, 15.3%) and glass compositions (C03C, 12.6%).
What the mineral wool patent record actually covers
Rock wool and mineral wool insulation patenting spans a wider chain than the finished batt or board: it runs from melt and fiberization control through binder chemistry to building assembly integration. The search set here is scoped to records that discuss fire classification, thermal conductivity, density, formaldehyde-free binders, shot content, fiber diameter or acoustic absorption inside mineral wool, rock wool or stone wool insulation contexts — narrowing the corpus to claims that engage the material’s core performance variables rather than incidental mentions.
Filing offices skew toward the manufacturing base of the industry: China and Japan lead receiving-office counts, with Europe, the UK and the US each posting sizeable but smaller shares, and WIPO PCT filings trailing behind the national routes. That distribution suggests most applicants are filing close to production and primary end markets rather than routing broadly through PCT first.
Filing trend and technology composition
Two views of the same 1,997-record set: how filing volume has moved year over year, and how those records distribute across IPC subclasses.
Filing trend: a 2019 peak, then a flat-to-declining run
Annual filings rose from 81 in 2017 to a peak of 138 in 2019, then settled near a midpoint of 95 by 2022. The 2026 count of 4 reflects the data cut-off, not a collapse in filing — publication lags filing by roughly 18 months, so the most recent one to two years will always look thinner than they eventually turn out to be.
Technology composition across eight IPC subclasses
Building structures and elements (E04B) carry the largest share at 21.0% of the 1,997 records, followed by layered products and laminates (B32B) at 15.3% and glass and enamel compositions (C03C) at 12.6%. Because a single record can carry several IPC classes, these shares sum to well over 100% — they describe where claim density sits, not a partition of the corpus.
Shares are the percentage of the 1,997 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Rock Wool and Mineral Wool Insulation with Eureka
This page is one run against one query. Ask Eureka your own question about rock wool and mineral wool insulation and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in the corpus
GB202019150D0 — "Mineral wool insulation" (Knauf Insulation, filed 2021-01-20)
This filing sits inside the same claim territory as the corpus's most-cited prior art on nonwoven fibrous insulation, waste-melt processing and mineral wool manufacture — the composition, binder and processing variables that recur across the highest-citation records above.Full claim text and family members are available in Eureka.
Open full record in Eureka →| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4847140A | Nonwoven fibrous insulation material | 175 |
| 2 | US5134944A | Processes and means for waste resources utilization | 166 |
| 3 | US4720295A | Controlled process for making a chemically homogeneous melt for producing mineral wool insulation | 129 |
| 4 | WO2009019232A1 | Mineral wool insulation | 113 |
| 5 | US20020000100A1 | Method and device for waste recycling in a mineral fibre manufacturing plant | 68 |
| 6 | US20110260094A1 | Mineral wool insulation | 66 |
| 7 | US20060179892A1 | Process for manufacturing products of mineral wool, in particular monolayer and multilayer products | 64 |
| 8 | US7514027B2 | Process for manufacturing products of mineral wool, in particular monolayer and multilayer products | 60 |
| 9 | WO1994020274A1 | Insulation barriers having a hydraulically settable matrix | 59 |
| 10 | US20070054121A1 | Graphite coating of particulate materials | 53 |
Citation counts inside a searched corpus favour older filings that have had more years to accumulate citations — read them as a signal of influence on later filers, not as a measure of current commercial relevance.
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 data means for filing strategy
Three read-outs from the trend, concentration and citation data that matter for anyone deciding where to file or challenge next.
Volume has cooled from its 2019 high
The field grew from 81 filings in 2017 to a peak of 138 in 2019, then eased toward a midpoint of 95 in 2022. That is a flat-to-declining trajectory rather than a growth curve, though the 2026 figure is still an undercount pending publication.
Leadership is real but not dominant
The five leading assignees combine for 22.3% of all 1,997 records, and the ranked ten reach 30.1%. That leaves roughly seven in ten records spread across a long tail of the ranked leaders — enough headroom for a well-targeted filing to compete on a specific sub-claim rather than face a single blocking incumbent.
Building-structure claims carry the most weight
E04B (building structures and elements) leads at 21.0% of records, ahead of B32B laminates at 15.3% and C03C glass compositions at 12.6%. Fresh claims that sit purely inside assembly and installation methods face the densest prior art; formulation-adjacent claims in D04H nonwovens or C09J adhesives carry comparatively lighter density.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to rock wool and mineral wool insulation, with the prior art for and against each one.
The assignee landscape
A leader with a substantial lead, a mid-tier of established insulation manufacturers, and a long tail of single- or few-filing entrants make up the ranked field of 100 companies.
One filer sits well ahead of the field
The leading assignee's 126 records is more than double the fifth-place count of 49, indicating a sustained, multi-year filing programme rather than a single burst of activity.
A workable mid-tier, then a long tail
Record counts halve between fifth and tenth place, and the ranking runs a full 100 companies deep — most of them well below the tenth-place mark. That long tail is where narrower, defensible claims are still being filed successfully.
Momentum has stalled across most tracked filers
None of the assignees tracked for recent-year momentum show growth in the latest year; several show a full year-over-year drop to zero. That is consistent with the flat-to-declining filing trend, not evidence that any single company has withdrawn from the field.
| Assignee | Recent year | YoY |
|---|---|---|
| Saint-Gobain Isover | 1 | 0% |
| Stora Enso Oyj | 0 | — |
| Knauf Insulation SPRL | 0 | -100% |
| Nitto Boseki Co., Ltd. | 0 | — |
| Nippon Steel Chemical & Material Co., Ltd. | 0 | — |
| FORESA TECH S L U | 0 | — |
| Rockwool International A/S | 0 | — |
| Isover Saint-Gobain SA | 0 | — |
Where to take this next
The landscape above sets the boundaries; the next steps depend on whether the goal is freedom-to-operate, portfolio benchmarking, or spotting an open claim.
Check freedom-to-operate against the most-cited records
The five highest-citation records anchor prior art in fiberization, waste-melt processing and binder composition. Any new filing touching those areas should be checked against them and their families before drafting claims.
Explore citation network in Eureka →Benchmark a target assignee's filing programme
With the leading assignee holding more than double the fifth-place count, understanding its filing cadence and claim scope is a useful reference point before entering the same sub-area.
Pull assignee portfolio in Eureka →Test claim novelty in the lighter-density subclasses
D04H nonwovens and C09J adhesives carry lower record shares than E04B and B32B, which may indicate room for a narrower, well-drafted claim rather than an already-crowded field.
Run a novelty search in Eureka →Common questions about mineral wool insulation patents
The dataset's leading assignee holds 126 records, more than double the fifth-place count of 49, which points to a sustained multi-year filing programme rather than a single spike. That said, the top five combined only account for 22.3% of all 1,997 records in scope, so no single company controls the field outright. A ranking of 100 companies is returned in the underlying data, with a long tail of firms holding far fewer filings each.
Filing peaked at 138 records in 2019, up from 81 in 2017, then eased toward a midpoint of 95 by 2022 — a flat-to-declining pattern rather than sustained growth. The 2026 count looks much lower, but that reflects publication lag of roughly 18 months rather than a real drop in R&D activity. Anyone reading a trend chart for this field should treat the last one to two years as understated.
Building structures and elements (E04B) carry the largest share at 21.0% of the 1,997 records, followed by layered products and laminates (B32B) at 15.3% and glass and enamel compositions (C03C) at 12.6%. Ceramics and cement (C04B), polymer compositions (C08L), adhesives (C09J), glass manufacture (C03B) and nonwovens (D04H) round out the remaining density. Because records can carry multiple IPC classes, these figures describe relative claim density rather than a strict partition of the corpus.
Relative to the corpus average, nonwoven and felt processing (D04H, 8.5% of records) and adhesive-layer bonding (C09J, 8.8%) carry lighter density than building-structure or laminate claims. Formaldehyde-free binder chemistry and fiber-diameter control within nonwoven manufacture are specific sub-areas worth checking for open claim space. A formal freedom-to-operate and novelty search against the most-cited records is still the right first step before drafting.
China leads receiving-office counts at 454, followed by Japan at 384, with Europe (EPO), the United Kingdom and the United States each posting smaller but meaningful shares. WIPO PCT filings trail the national routes at 85. That pattern suggests most applicants are filing close to manufacturing bases and primary end markets rather than defaulting to a PCT-first strategy.
Research Rock Wool and Mineral Wool Insulation in depth with Eureka
Go past this page: query the whole rock wool and mineral wool insulation 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.