Cable Accessories Patents: Leaders, Trends & White Space 2026
- One leader, then a long tail. the top assignee holds 44 records against a fifth-place count of 8 and a tenth-place count of 6 across 28 ranked companies.
- Filing activity has flattened, not accelerated. the trend peaked at 13 records in 2020 and sat at 6 by the 2022 midpoint, with no sign of renewed growth before the most recent partial year.
- Almost every record sits in one installation class. H02G covers 99.3% of the 144 records in scope, while connector, insulation and polymer-composition classes each cover a much smaller slice.
What this patent set covers
Cable joints and terminations sit at the mechanical and electrical seam between insulated power cable sections and the equipment or cable runs they connect to. The claims in this dataset cluster around field grading (controlling electrical stress at the joint interface), interface pressure between accessory and cable insulation, and the practical divide between prefabricated and taped construction methods. Partial discharge performance and installation workmanship show up as recurring evaluation criteria inside the claims themselves, not just as test methods.
The 144 records in scope span filings from 2015 through mid-2026, concentrated in the H02G installing-cables subclass with secondary coverage in connectors, cable/conductor construction, and the polymer compositions used in stress-control layers. Publication lags filing by roughly 18 months, so the most recent year understates real activity.
Filing trend and technology mix
Two views of the same 144-record set: how filing activity moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017–2026
Filings ran at 12 in 2017, rose to a peak of 13 in 2020, then eased to 6 by the 2022 midpoint. The most recent year shows 0, which reflects publication lag rather than a stop in filing.
IPC subclass composition
H02G (installing power and signal cables) appears in 99.3% of the 144 records in scope, effectively defining the field. H01R (connectors) at 13.9% and H01B (cables, conductors and insulators) at 13.2% mark the next tier, with polymer-composition classes such as C08L trailing at 5.6%.
Shares are the percentage of the 144 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Cable Accessories: Joints and Terminations with Eureka
This page is one run against one query. Ask Eureka your own question about cable accessories: joints and terminations and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this set
US10250021B2 — Method of manufacturing a high-voltage DC cable joint, and a high-voltage DC cable joint
A high-voltage DC cable joint with a multi-wall layered construction: an inner conductive rubber layer, a field grading rubber layer made from a tailored formulation, an insulating rubber layer and an outer conductive rubber layer, cross-linked by a by-product-free manufacturing method and preferably injection moulded from platinum-cured rubbers.Filed by NKT HV Cables AB, published 2019-04-02.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5406030A | High voltage, high-current power cable termination with single condenser grading stack | 27 |
| 2 | EP2197080A1 | Flexible joint with resistive field grading material for HVDC cables and method for connecting same to HVDC c… | 24 |
| 3 | EP3109958A1 | Field control element for a high-voltage cable accessory and method of optically measuring partial discharges | 21 |
| 4 | EP3148027A1 | A cable fitting for connecting a high-voltage cable to a high-voltage component | 20 |
| 5 | FR2557390A1 | Jointing of medium tension paper insulated electric cable | 19 |
| 6 | US20130075124A1 | High Voltage Direct Current Cable Termination Apparatus | 17 |
| 7 | CN103038965A | 高压直流电缆终端装置 | 13 |
| 8 | WO2011144254A2 | A high voltage direct current cable termination apparatus | 13 |
| 9 | US20180219369A1 | Cable fitting for connecting a high-voltage cable to a high-voltage component | 11 |
| 10 | EP3034561A1 | A method of manufacturing a high-voltage DC cable joint, and a high-voltage DC cable joint. | 11 |
Citation counts inside a searched corpus favour older filings and should be read as a signal of influence, not current 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 data means for filing strategy
Reading the ranking, the trend and the citation table together points to where the claim space is occupied and where it is thin.
One dominant filer, then a steep drop-off
The leading assignee's record count is more than five times the fifth-placed filer's, and the gap to tenth place is even wider. That gap suggests the leader has built a defensive perimeter around core field-grading constructions rather than facing a crowded top tier.
Activity has cooled since 2020
Filing volume peaked in 2020 and had roughly halved by the 2022 midpoint, with no evidence of a rebound in the years shown. New entrants should weigh whether this reflects a maturing claim space or a lull ahead of a materials-driven refresh.
Installation claims dominate; materials claims are thin
Nearly every record touches the H02G installing-cables subclass, while polymer-composition classes like C08L (5.6%) and C08K (1.4%) appear far less often. That imbalance points to construction and interface claims being heavily worked, with the underlying stress-control materials comparatively open.
A small cluster of named inventors files together repeatedly
The strongest co-assignee pairs each share 14 records, out of only 10 identified co-assignee pairs overall. That pattern indicates a tight inventing team rather than broad industry collaboration on joint filings.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to cable accessories: joints and terminations, with the prior art for and against each one.
Assignee landscape and where the gaps sit
The ranked list covers 28 companies across the 144-record set, led by one filer with a wide margin over the rest.
A clear leader in field-grading and joint construction
The top-ranked assignee's count sits well above every other filer in the set, consistent with a portfolio built around layered joint construction and field grading materials rather than a single flagship patent.
A cluster of established cable manufacturers
Fifth place holds 8 records, and tenth place holds 6 — a gentle taper rather than a cliff, suggesting several established cable and accessory manufacturers maintain modest but active portfolios.
Many single- or low-filing entrants
Beyond the top tier, the ranking includes individually-named inventors alongside corporate assignees, indicating that some of the most cited early work originated from small teams rather than large filing programmes.
| Assignee | Recent year | YoY |
|---|---|---|
| Abo Research Ltd. | 0 | — |
| NKT HV Cables AB | 0 | -100% |
| ABB (Switzerland) Ltd. | 0 | — |
| UNGE MIKAEL | 0 | — |
| SALTZER MARKUS | 0 | — |
| NKT HV Cables GmbH | 0 | — |
| LI MING | 0 | — |
| GAFVERT UNO | 0 | — |
Where to take this analysis
The dataset points to specific follow-up questions rather than a single conclusion.
Check freedom-to-operate around the leader's core claims
With a single assignee holding 44 of 144 records, any new joint or termination design should be checked against that portfolio's field grading and layered-construction claims before development scales.
Explore claim mapping in EurekaTrack whether polymer-composition filings pick back up
C08L and C08K classes remain thin relative to H02G. A materials-driven refresh in stress-control formulations would likely show up first in these subclasses.
Set up a monitoring alert in EurekaInvestigate the co-assignee cluster's recent activity
The strongest co-assignee pairs share 14 records each, but recent-year momentum data shows several of these same names at zero in the latest year. Whether that is publication lag or a genuine pause is worth confirming directly.
Review assignee timelines in EurekaCommon questions on cable joint and termination patents
Within this 144-record dataset, one assignee leads with 44 records, well ahead of the fifth-ranked filer at 8 and the tenth-ranked filer at 6, across a ranked list of 28 companies. That gap suggests a concentrated portfolio around field grading and layered joint construction rather than a crowded top tier. Anyone entering this space should review that leader's claims first, since freedom-to-operate risk is likely concentrated there rather than spread evenly across the field.
Filing activity peaked at 13 records in 2020 and had fallen to 6 by the 2022 midpoint, with the most recent year showing 0 — though that final figure is understated because publication typically lags filing by about 18 months. Taken together, the trend looks flat to declining rather than accelerating. This does not necessarily mean innovation has stopped; it may mean the core constructions are well claimed and new work is shifting toward materials or sensing rather than joint geometry.
Field grading refers to controlling electrical stress concentration at the interface between a cable's insulation and the joint or termination accessory, typically using resistive or capacitive materials engineered into the joint body. It is one of the core claim themes in this dataset, appearing in several of the most-cited records including layered rubber constructions and resistive field-grading materials for HVDC cables. Because it is so central to accessory performance, field-grading claims tend to be tightly held by established cable manufacturers rather than open territory for new entrants.
US10250021B2, assigned to NKT HV Cables AB and published in 2019, covers a method of manufacturing a high-voltage DC cable joint with a specific multi-wall layered construction: an inner conductive rubber layer, a tailored field-grading rubber layer, an insulating rubber layer and an outer conductive rubber layer, cross-linked by a by-product-free process and preferably injection moulded from platinum-cured rubbers. It blocks that specific layer sequence and manufacturing route rather than field grading in general, so alternative layer orderings, different cross-linking chemistries, or non-rubber grading materials may sit outside its claims. Anyone designing a competing DC joint should map their construction against this specific sequence rather than assume field grading as a concept is blocked.
The IPC composition data shows H02G (installing cables) present in 99.3% of the 144 records, while polymer-composition classes such as C08L sit at only 5.6% and C08K at 1.4%, and substation-side integration under H02B at 3.5%. That imbalance points to construction and interface claims being heavily worked while the underlying stress-control material formulations, additive packages, and substation-side accessory integration remain comparatively open. A first claim in these areas would likely centre on a specific additive chemistry or a substation-interface geometry rather than another layered-joint construction.
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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.
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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.