Cable Insulation Materials Patents: Leaders & Filing Trends 2026
- 36.6% concentration at the top. The five leading assignees combined account for 964 of the 2,632 records in scope — a field where a handful of filers have staked out most of the crosslinked polyethylene and additive-stabilisation claim space.
- Filing has cooled from its 2018 peak. Activity peaked at 130 records in 2018 and, on the last complete comparison window, moved from 38 records in 2021 to 28 in 2024 — a -26% change with the caveat that recent years still lag publication.
- H01B dominates, but additive chemistry is close behind. 65.4% of records sit in H01B (cables, conductors & insulators), while 38.1% also touch C08K additive claims — insulation performance is increasingly won or lost in the compounding, not just the layer structure.
Filing growth compares 2021 (38 records) with 2024 (28) — 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 2,632 records in scope (CR5), not by the ranked leaders only.
What this dataset covers
This landscape covers 2,632 published records filed or published between 2015 and the 2026-07-31 data cut-off, matched on cable insulation compounds and the specific failure modes that drive replacement and R&D spend: water treeing, space charge accumulation, degassing time control, thermal ageing, recyclability and impurity control. The search string deliberately pairs insulation-material terms with these degradation and processing signals, so the corpus skews toward records that address why an insulation fails or how it is made safer to process, rather than generic cable construction.
Publication lags filing by roughly 18 months, so the most recent one to two years in any trend understate real filing activity. Patent families, not raw document counts, are the fairer unit for judging genuine white space versus aggressive continuation filing in a single jurisdiction.
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Filing trend and technology composition
Two views of the same 2,632 records: how filing activity has moved year on year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017-2026
Filings ran from 87 records in 2017 to a peak of 130 in 2018, then eased; on the last complete three-year comparison, 2021's 38 records fell to 28 in 2024, a -26% move. 2025 and 2026 figures are still filling in under the publication lag and should not be read as a continued decline.
IPC subclass composition
H01B (cables, conductors & insulators) covers 65.4% of the 2,632 records, with C08K additive claims at 38.1% and C08L polymer-composition claims at 34.8%. Because records carry multiple IPC codes, these shares add to more than 100% — the overlap itself shows how tightly insulation-layer claims and additive-chemistry claims are drafted together.
Shares are the percentage of the 2,632 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Cable Insulation Materials with Eureka
This page is one run against one query. Ask Eureka your own question about cable insulation materials and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
US11031153B2 — Water tree resistant cables
Water tree resistant cables are disclosed. The cables include a water tree resistant insulation shield and water tree resistant conductor shield. The insulation layer can be free of any water tree retardant additives. Methods of making and using the water tree resistant cables are further disclosed.Filed by General Cable Technologies Corporation, published 2021-06-08.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5246783A | Electrical devices comprising polymeric insulating or semiconducting members | 1,018 |
| 2 | US4144202A | Dielectric compositions comprising ethylene polymer stabilized against water treeing with epoxy containing or… | 256 |
| 3 | US20130306351A1 | Insulated electric cable | 224 |
| 4 | WO1996035732A1 | Ethylene polymer containing silicon and method for the preparation thereof | 183 |
| 5 | US4305849A | Polyolefin composition containing high molecular weight polyethylene glycol useful for electrical insulation | 167 |
| 6 | US6511756B1 | Thermoplastic dicyclopentadiene-base open-ring polymers, hydrogenated derivatives thereof, and processes for … | 133 |
| 7 | EP1695996A1 | Scorch-retarding polymer composition | 111 |
| 8 | US20110079427A1 | Insulated non-halogenated covered aluminum conductor and wire harness assembly | 104 |
| 9 | US6879861B2 | Polymeric materials with improved dielectric breakdown strength | 104 |
| 10 | WO2006131266A1 | Water tree retarding composition | 103 |
Citation counts favour older filings simply because they have had longer to accumulate citations inside the searched corpus — treat this as a signal of influence on later drafting, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Reading the concentration, technology mix and citation pattern together points to where claim space is occupied and where it is still worth probing.
The top of the field is dense, the tail is long
Five assignees hold 964 of the 2,632 records in scope, and the top ten extend that to 1,343 records, 51.0% of the field. Below that line, the ranking thins quickly — a pattern consistent with a mature core chemistry (crosslinked polyethylene, silane-based stabilisation) defended by a small number of long-standing filers, with newer entrants filing singly rather than building portfolios.
Additive chemistry is where the second wave of claims sits
H01B claims describe the cable and insulation structure itself, but over a third of records also file under C08K (use of additives in polymers) and nearly as many under C08L (polymer compositions). That overlap suggests the differentiated ground now is less about layer architecture and more about what goes into the compound — antioxidants, silane crosslinkers, impurity scavengers.
Filing has slowed from its 2018 peak but has not stopped
The field peaked at 130 records in 2018 and the last complete comparison window shows a -26% move between 2021 (38 records) and 2024 (28 records) among the leading filers. That is a real deceleration, not evidence the technology is closed — recent filings are still working through the publication lag and 2025-2026 figures will rise as they clear.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to cable insulation materials, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Dow Global Technologies LLC | Dow Corning Corporation | 12 |
| Dow Global Technologies LLC | COGEN JEFFREY M | 11 |
| Dow Global Technologies LLC | SUN YABIN | 10 |
| Dow Global Technologies LLC | PERSON TIMOTHY J | 9 |
| Union Carbide Corp | Dow Corning Corporation | 9 |
| Novinium LLC | BERTINI GLEN J | 8 |
| General Cable Technologies Corporation | EASTER MARK R | 6 |
| Union Carbide Corp | STAGI WILLIAM R | 6 |
Only 10 co-assignee pairs appear in the dataset, and the strongest links all involve the same leading filer paired with related corporate entities or named inventors — evidence of internal group filing structure rather than cross-company collaboration.
Who is filing, and where the gate is open
The ranked leaders account for just over half of all filings between them; everyone else is filing into an already-claimed core chemistry or working the edges the leaders have not prioritised recently.
One filer sits well ahead of the field
The top-ranked assignee holds 285 records against a fifth-place figure of 96 and a tenth-place figure of 60 — a steep drop-off that signals a genuinely dominant filer rather than a cluster of near-equal competitors at the top.
Several leading filers have gone quiet in the latest tracked year
Multiple assignees that built large historical portfolios show zero filings in the most recent year, including a -100% year-on-year move for one of the largest holders. Given the roughly 18-month publication lag, this understates their true current activity, but it is still consistent with the sector's broader cooling from its 2018 peak.
Half the field sits outside the ten leading filers
With the top ten holding 51.0% of records, the remaining 49% is spread across ninety further ranked assignees plus unranked entrants. That is where opportunistic, narrowly-scoped filings on specific additive packages or degassing process tweaks tend to sit.
| Assignee | Recent year | YoY |
|---|---|---|
| Prysmian S.p.A. | 2 | — |
| Borealis AG | 0 | — |
| Dow Global Technologies LLC | 0 | -100% |
| Union Carbide Chemicals & Plastics Technology LLC | 0 | — |
| General Cable Technologies Corporation | 0 | — |
| Fujikura Ltd. | 0 | — |
| Borealis Tech Oy | 0 | — |
| Novinium LLC | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio benchmarking, or scouting white space.
Check freedom-to-operate against the dense core
With 65.4% of records in H01B and over a third also in C08K, any new insulation-layer or additive claim should be checked against the leading assignees' portfolios before drafting, not after.
Run a claim comparison in EurekaTrack momentum shifts among leading filers
Several large historical filers show zero activity in the latest tracked year. Watching whether that reverses as 2025-2026 publications clear the lag is a cheap early signal of where competitive investment is heading.
Set up momentum tracking in EurekaScope drafting around under-claimed branches
Degassing time reduction, recyclable insulation formulations and space charge suppression show lighter filing density than the core chemistry — each is a candidate area for a narrowly scoped first claim.
Explore white space in EurekaCommon questions on cable insulation materials patents
The assignee ranking in this dataset is led by a single filer with 285 records, well ahead of the fifth-place holder at 96 and the tenth-place holder at 60. The top five assignees combined account for 964 of the 2,632 records in scope, or 36.6% of the field, and the top ten extend that to 51.0%. This concentration is typical of a mature core chemistry where a small number of long-standing filers, largely in crosslinked polyethylene and silane-stabilisation chemistry, hold most of the foundational claims.
Filing peaked at 130 records in 2018 and has since eased; on the last complete three-year comparison, the leading assignees' filings moved from 38 records in 2021 to 28 in 2024, a -26% change. Because publication lags filing by roughly 18 months, the 2025 and 2026 figures in any trend chart are still incomplete and should not be read as confirming a continued decline. The honest read is a field that has cooled from a 2018 peak but has not stopped generating new filings.
H01B, covering cables, conductors and insulators, appears in 65.4% of the 2,632 records in scope, making it the dominant classification by a wide margin. C08K, use of additives in polymers, and C08L, polymer compositions, follow at 38.1% and 34.8% respectively, and because a single record can carry multiple IPC codes these figures overlap rather than sum to 100%. The overlap itself is informative: it shows that insulation-layer structure and additive chemistry are frequently claimed together rather than in isolation.
Relative to the dense H01B, C08K and C08L core, sub-areas such as degassing time reduction methods, recyclable crosslinked polyethylene formulations, space charge suppression additives for DC cable applications, and in-line thermal ageing monitoring show comparatively lighter filing density in this corpus. These are not guaranteed to be open — a full freedom-to-operate search is still required — but they are reasonable starting points for scoping a narrowly drafted first claim rather than filing directly against the crowded core insulation-compound claims.
US11031153B2, assigned to General Cable Technologies Corporation and published 2021-06-08, claims water tree resistant cables built from a water tree resistant insulation shield and conductor shield, notably allowing the insulation layer itself to be free of water tree retardant additives. That structural approach to water-treeing resistance, rather than relying purely on additive packages, is a distinct design route from the additive-heavy claims that dominate the C08K portion of this dataset. Anyone drafting insulation-shield or conductor-shield claims for water tree resistance should review this filing's specific claim scope before finalising a design.
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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.