Flame Retardant Cable Sheathing Patents: Leaders & Trends 2026
- 84.2% concentration. The top 5 assignees hold 64 of 76 records in scope — a field with a short, dominant leader group rather than a broad field of independent filers.
- Filing peaked in 2021. 13 filings that year, falling to 0 by 2024 (the last complete year) — a documented -100% swing over three years, not a slow decline.
- Composition claims dominate. C08K additive and C08L polymer-composition classes each cover the majority of records, while coatings, optics and shaping classes sit in single digits.
Filing growth compares 2021 (13 records) with 2024 (0) — 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 76 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families disclosing flame retardant cable sheathing compounds — formulations and processes built around magnesium hydroxide loading, elongation at break, extrusion processability, flame propagation testing, water absorption and coupling agents, searched against low smoke zero halogen (LSZH) sheathing claims specifically. It spans records published between 2015 and the 2026-07-31 cut-off, drawing on 76 records in scope.
The field sits almost entirely inside cable and conductor engineering rather than general polymer chemistry: the H01B cables/conductors/insulators class touches the large majority of records, with additive and polymer-composition classes close behind. Coatings, optical fibre cabling and plastics-shaping appear only as minority branches.
Filing trend and technology composition
Two views of the same 76 records: how filing activity has moved year on year, and which IPC subclasses the claims actually sit in.
A sharp 2021 peak, then a fall to zero by 2024
Filings rose from 3 in 2017 to a peak of 13 in 2021, then fell to 0 by 2024 — the last year that can be treated as complete, since publication typically lags filing by around 18 months. Records from 2025 onward are still filling in and should not be read as a continued decline; treat them as incomplete rather than confirmatory.
Composition and additive claims lead the field
H01B (cables, conductors & insulators) appears on 84.2% of the 76 records, with C08K (polymer additives) on 73.7% and C08L (polymer compositions) on 63.2% — together showing that most claims are written as compound formulations for cable structures rather than as standalone chemistry. Coatings (C09D), materials for miscellaneous applications (C09K) and optical elements (G02B) each sit at 7.9%, and plastics shaping (B29C) and addition polymers (C08F) are minority branches with very few records.
Shares are the percentage of the 76 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Flame Retardant Cable Sheathing Compounds with Eureka
This page is one run against one query. Ask Eureka your own question about flame retardant cable sheathing compounds and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this landscape
Flame-retardant cable with self-extinguishing coating layer (US20220148760A1)
A flame-retardant cable having a core is disclosed. The cable contains at least one conductor and a coating made from a low smoke zero halogen flame-retardant polymer composition. The polymer composition contains a halogen free base polymer added with a) less than 170 phr of at least one metal hydroxide; b) from 1 to 10 phr of a phyllosilicate clay; c) at least 1 phr and less than 10 phr of melamine or a derivative thereof; and d) an alkali or alkaline-earth metal carbonate. The cable has improved reaction to fire performances especially in that no dripping occurs during burning, which renders it compliant with the requirements of the more recent international standards.Filed by Prysmian, the top-ranked assignee in this dataset, and one half of the strongest co-assignee pairing in the field.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN101613506A | 耐高温无卤阻燃电缆护套料及其制备方法 | 39 |
| 2 | CN104262773A | 一种耐油耐寒高阻燃低烟无卤电缆料及制备方法 | 23 |
| 3 | CN102977451A | 用于光缆的低烟无卤阻燃护套层 | 17 |
| 4 | CN103102579A | 无卤膨胀阻燃电缆外护套料的组合物及其制备方法 | 15 |
| 5 | CN104744753A | 一种抗开裂热塑性低烟无卤阻燃聚烯烃材料及其制备方法 | 14 |
| 6 | CN103739928A | 一种硅树脂增效的高性能低烟无卤电力电缆护套料及其制造方法 | 11 |
| 7 | CN103849063A | 光缆用抗粘连低烟无卤阻燃电缆料 | 11 |
| 8 | CN102952313A | 高压电缆护套用低烟无卤阻燃材料 | 11 |
| 9 | CN105348646A | 一种改性聚丙烯基低烟无卤电缆料及制备方法 | 10 |
| 10 | CN106009242A | 一种船用电缆用低烟无卤阻燃护套材料及制备方法 | 9 |
Citation counts favour older records simply because they have had longer to accumulate citations inside this corpus — treat them as a signal of influence on the field, not of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Read together, the concentration figures, the filing trend and the technology mix point to a field where the claim space around core formulations is largely occupied, but several adjacent branches are not.
A short leader group, not a crowded field
The top 5 assignees combined hold 64 of the 76 records in scope — 84.2% of the field — and the top 10 account for all 76. New entrants filing in the core LSZH sheathing composition space are filing directly against a small number of well-established portfolios rather than into open territory.
A defined peak, then a drop to zero
Filing activity rose to a peak of 13 records in 2021 and fell to 0 by 2024, the last year in the dataset that can be treated as complete. That is a documented swing, not a gradual slowdown, and it lines up with the leading assignees showing no recorded activity in the latest year of data.
Formulation claims outweigh process and coating claims
Polymer-composition (C08L) and additive (C08K) classes cover the large majority of records, while coatings, optical cabling and plastics-shaping classes each sit near or below 8%. Compounding and formulation work is the densest part of the field; processing and application-layer claims are comparatively thin.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to flame retardant cable sheathing compounds, with the prior art for and against each one.
Who holds the ranked lead, and where the gate sits
The leader in this dataset holds 31 records against a fifth-place figure of 4 and a tenth-place figure of 2 — a steep drop-off that defines where a new filer would need to differentiate rather than compete head-on.
A clear single leader
The top-ranked assignee holds 31 of the 76 records in scope, well ahead of the field. Its portfolio, together with a long-running co-assignee relationship with an Italian technical university, anchors much of the dense composition-claim territory in this dataset.
A fast drop after the leader
Filing counts fall away quickly after the leader: fifth place sits at 4 records and tenth place at just 2. Several China-based cable manufacturers cluster in this band, each holding a handful of formulation or processing filings rather than a broad portfolio.
China is the dominant receiving office
China accounts for 41 filings, well ahead of the EPO at 14 and the United States at 10, with Australia and Austria trailing further behind. Filing strategy in this field is heavily weighted toward Chinese domestic protection alongside a smaller European and US layer.
| Assignee | Recent year | YoY |
|---|---|---|
| Prysmian S.p.A. | 0 | — |
| Politecnico di Milano | 0 | — |
| Suzhou Hengli Communication Material Co., Ltd. | 0 | — |
| Jiangsu Hengtong Wire & Cable Technology Co., Ltd. | 0 | — |
| Jiangsu Hengtong Power Cable Co., Ltd. | 0 | — |
| Hengtong Optic-Electric Co., Ltd. | 0 | — |
| Shenzhen Zhizheng Polymer Materials Co., Ltd. | 0 | — |
| Hunan University of Technology | 0 | — |
Where to take this next
The dataset points to a concentrated core and a thinner set of adjacent branches. The next steps depend on whether the goal is freedom-to-operate, portfolio benchmarking or identifying where to file.
Check freedom-to-operate against the leader's portfolio
With one assignee holding 31 of 76 records and a strong co-assignee link to a university partner, any new formulation claim in the core magnesium-hydroxide-loading space should be checked directly against that combined portfolio first.
Run a freedom-to-operate check in EurekaScope claims in the under-claimed branches
Coatings, optical cable integration and process/equipment classes each hold only a handful of records. A first claim written around one of these branches has more open space than a fifth composition claim in the crowded core.
Explore white space in EurekaWatch for the 2025 publication catch-up
The apparent drop to zero filings by 2024 reflects the dataset's cut-off as much as the field itself, since publication lags filing by roughly 18 months. Re-run this trend once later years have filled in before concluding the field has gone quiet.
Track filing trends in EurekaCommon questions on this landscape
The dataset ranks 27 companies, with the top-ranked assignee holding 31 of the 76 records in scope. The next four assignees combined bring the top 5 to 84.2% of all records, after which the field drops off quickly to single-digit counts by fifth and tenth place. This is a concentrated field: most of the documented claim space belongs to a small group rather than being spread evenly across many filers.
Filing activity peaked at 13 records in 2021 and fell to 0 by 2024, the most recent year in the dataset that can be treated as complete. That looks like a sharp drop, but publication lags filing by roughly 18 months, so 2025 and later years are still filling in and should not yet be read as confirmation of a continued decline. The safest read is that the field had a defined burst of activity around 2021 and has not yet shown a comparable second wave in the completed data.
The large majority of records sit in H01B (cables, conductors and insulators), C08K (polymer additives) and C08L (polymer compositions), reflecting formulations built around magnesium hydroxide loading, coupling agents and related additive chemistry inside a cable structure. Smaller shares touch coatings, optical cabling and plastics-shaping processes. Since records can carry multiple IPC codes, these shares add up to more than 100% of the 76 records, and the smaller branches represent genuinely thinner claim territory rather than a rounding effect.
The dense claim territory is the core LSZH composition space — magnesium hydroxide loading, coupling agents, extrusion processability — held mostly by the top-ranked assignees. Branches with only single-digit record shares, such as coatings, optical cable sheathing integration and plastics-shaping process claims, are comparatively under-claimed. A first filing there has more room to stand on its own than another formulation claim competing against an 84.2%-concentrated core.
China is the dominant receiving office with 41 filings, well ahead of the EPO at 14 and the United States at 10, with Australia and Austria further behind. This weighting toward China reflects both the concentration of leading cable manufacturers there and the domestic scale of cable infrastructure build-out. A filer targeting only US or European protection would be covering a smaller share of where this technology is actually being filed.
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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.