Building Thermal Insulation Materials Patents: Leaders & White Space 2026
- Filing has flattened, not grown. activity peaked at 8 families in 2025 after a flat-to-declining run from a 2022 midpoint of 7, so the field is not in a growth phase.
- Panel and structural claims dominate the IPC mix. E04B building-structure claims appear in 101 of 117 families, with B32B laminates (38) and E04C structural components (34) as the next densest layers.
- Ownership is fragmented, not consolidated. only six co-assignee pairings exist across the dataset, and the tightest cluster centres on one filer (Opstalan) working with two separate partners rather than a broad alliance.
What this landscape covers
This review covers 117 patent families filed between 2015 and mid-2026 that combine building or panel-form insulation claims with thermal conductivity, fire performance, vacuum-panel, moisture-management or aging limitations, filtered to E04B1, C04B38 and C08J9. The corpus spans conventional building-structure insulation through to vacuum insulation panels and layered composite constructions, with filings concentrated at the European, US and Chinese patent offices.
Publication lags filing by roughly 18 months, so the 2026 count in any trend chart understates real activity for that year. Treat the most recent one to two years as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 117 families: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
A flat-to-declining filing curve
Filings rose from 2 in 2017 to a midpoint of 7 in 2022, then peaked at 8 in 2025 before the partial 2026 count. That trajectory reads as a mature, steady-state field rather than one still attracting new entrants at pace — useful context before assuming any single year's dip or spike is meaningful.
Concentration in building structures, thin in polymer processing
E04B (building structures & elements) anchors 101 of 117 families, meaning almost every filing touches a structural or building-integration claim regardless of its underlying material. B32B laminates, E04C structural components and F16L pipe fittings form a dense second tier, while C08J polymer processing sits at just 6 records — a thin layer relative to how much material science underlies aerogel and foam insulation.
Shares are the percentage of the 117 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Building Thermal Insulation Materials with Eureka
This page is one run against one query. Ask Eureka your own question about building thermal insulation materials and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
EP2602395A4 — Vacuum Thermal Insulation Panel (VAKUUMWÄRMEDÄMMPLATTE)
Filed by XL Co., Ltd., this family claims a vacuum insulation panel construction addressing thermal conductivity and structural durability in a sealed-envelope panel format — the same functional territory as the corpus's most-cited prior art on vacuum thermal insulation panels.Publication and assignee details are rendered from the underlying record; the abstract above summarises its stated subject matter.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4444821A | Vacuum thermal insulation panel | 170 |
| 2 | US6037033A | Insulation panel | 168 |
| 3 | US5875599A | Modular insulation panels and insulated structures | 107 |
| 4 | US4514450A | Peg supported thermal insulation panel | 66 |
| 5 | US6134853A | Interlocking insulated building block system | 61 |
| 6 | WO2003064025A1 | Heat resistant aerogel insulation composite and method for its preparation; aerogel binder composition and me… | 57 |
| 7 | CA2259665A1 | Insulation panel | 56 |
| 8 | US5822939A | Insulated building block system | 52 |
| 9 | US20100139195A1 | Encapsulated composit fibrous aerogel spacer assembly | 45 |
| 10 | US4828635A | Laminated, thermal insulation panel | 38 |
Citation counts accumulate over time and favour older filings; read them as markers of foundational influence, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once the raw counts are read against each other: where claim density sits, where citation weight concentrates, and how thin the collaboration network is.
Building-structure claims are the common denominator
Nearly every family in this corpus, regardless of its underlying insulation chemistry, is drafted with at least one building-structure or building-element claim under E04B1. A filer entering with a novel material still needs to clear this structural claim layer, not just a materials-science one.
Foundational vacuum-panel art still anchors the field
The most-cited record in the corpus, a vacuum thermal insulation panel filing, carries 170 citations — well ahead of the next tier. That concentration signals the vacuum-panel construction problem was substantially staked out early, and later filings largely build around rather than over it.
Filing is largely solo, not networked
Only six co-assignee pairings exist across 117 families, and the strongest cluster is a single filer, Opstalan, paired separately with two different partners. There is no broad cross-licensing or joint-venture pattern visible in the assignment data — most parties are filing independently.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to building thermal insulation materials, with the prior art for and against each one.
Assignee landscape and where the gaps sit
No single assignee dominates this corpus; recent-year momentum data shows several established filers at zero activity in the latest year, including one down 100% year over year, which points to a fragmented field with room for new entrants to establish position.
Established filers have gone quiet
Several assignees with prior activity, including Sika Technology, show zero filings in the most recent tracked year, with Sika down 100% year over year. That does not necessarily mean disengagement — publication lag means 2025-2026 filings may still surface — but it does mean current published activity is thin at the top.
One filer anchors the only visible cluster
Opstalan appears in the two strongest co-assignee pairings in the dataset, alongside Level Energietechniek and Isoltra Int respectively, each at 5 shared families. Outside this cluster, co-filing is essentially absent, meaning most IP in this space is held by single entities rather than joint ventures.
Europe leads receiving-office volume, not any one country
The EPO receives more filings (25) than the US (21) or China (16) individually, with WIPO/PCT (11) and Canada (7) trailing. That spread suggests applicants are pursuing European regional protection alongside national US and Chinese filings rather than concentrating on a single jurisdiction.
| Assignee | Recent year | YoY |
|---|---|---|
| Refoss Holdings | 0 | — |
| HAENER JUAN | 0 | — |
| Oxford Brookes University | 0 | — |
| Sika Technology AG | 0 | -100% |
| Wiat Corporation | 0 | — |
| Cabot Corporation | 0 | — |
| OPSTALAN | 0 | — |
| LEVEL ENERGIETECHNIEK | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, competitive tracking, or identifying open claim space.
Map claims against the dense E04B/B32B cluster
Before drafting in building-structure or laminate insulation, run a claim chart against the top-cited vacuum-panel and modular-panel families to see how close a proposed construction sits to existing claim boundaries.
Explore claim charting in EurekaTrack the quiet incumbents for renewed activity
Several assignees show zero recent-year filings despite prior activity; given publication lag, renewed filings from these parties could surface in the next 12-18 months and are worth a standing watch.
Set up assignee monitoring in EurekaTest the under-claimed branches for a first-mover filing
Aerogel aging performance and vacuum-panel moisture ingress carry thin family counts relative to the core building-structure cluster, making them candidates for a narrowly scoped first claim rather than a crowded one.
Run a white-space search in EurekaCommon questions on building thermal insulation patents
The dataset of 117 patent families shows a fragmented ownership picture rather than a single dominant holder. Several assignees, including Sika Technology and others tracked in recent-year momentum data, have filed multiple families historically but show zero activity in the most recent tracked year. Because publication lags filing by roughly 18 months, this likely reflects reporting delay as much as any real pullback, so a current ranking should be read as directional rather than final.
Filing activity has been flat to declining rather than growing: the trend moved from 2 families in 2017 to a midpoint of 7 in 2022, and peaked at only 8 in 2025. That pattern is more consistent with a mature field where claim space around core constructions like vacuum insulation panels is already occupied, and new activity is incremental rather than expansionary. High filing density in the past does not mean the underlying technology has stopped evolving, only that the claim space is well populated.
E04B covers building structures and elements and is the single most common classification in this corpus, appearing in 101 of 117 families, because most insulation filings include at least one claim about how the material integrates into a building structure. C04B covers ceramics, cement and refractories and appears in only 19 families, representing filings focused more narrowly on the insulation material's composition rather than its building integration. A filing strategy that only addresses material composition under C04B without an E04B integration claim may be leaving structural claim territory uncontested.
The thinnest layers in this corpus sit outside the dense E04B, B32B and F16L cluster: C08J polymer processing and solutions has only 6 records, and B01J chemical and physical processing has 9, both far below the 101-family weight of building-structure claims. Sub-areas such as aerogel-composite aging performance and vacuum-panel moisture ingress are correspondingly under-claimed relative to core panel construction. These branches are worth a targeted search before assuming they are crowded, since low family counts in a search like this one can indicate either genuine white space or simply narrower search-term coverage.
EP2602395A4, filed by XL Co., Ltd. under the title Vacuum Thermal Insulation Panel, claims a vacuum insulation panel construction addressing thermal conductivity and durability in a sealed envelope format. It sits in the same functional territory as the corpus's highest-cited prior art on vacuum thermal insulation panels, some of which carry over 100 citations, meaning the core vacuum-panel construction problem has substantial prior art around it. Any new filing in this space should be checked against both this family and the older, more heavily cited vacuum-panel patents rather than assuming novelty from a later filing date alone.
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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.