Overhead Conductor Patents: Who Leads, Where the Gaps Are 2026
- One filer dominates the ranked field. the leading assignee holds 226 of the records behind a 66-company ranking, with a steep drop to fifth place at 22 and tenth at 14.
- Filing has cooled from its 2017 peak. activity ran as high as 55 records that year, and the tracked 2021-to-2024 span shows an 82% decline (34 to 6) before the most recent, still-incomplete years.
- Coatings and cable materials, not just conductor geometry, carry the claim density. H01B cable/conductor claims sit in 63.7% of records but C09D coatings claims sit in 38.3% of the same 454-record set.
Filing growth compares 2021 (34 records) with 2024 (6) — 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.
What this landscape covers
Overhead conductor and line uprating patents cover the physical hardware and methods used to carry more current over existing towers without violating ground clearance: composite and fiber-reinforced cores that resist sag at higher operating temperatures, surface coatings that manage emissivity and corrosion, and the stringing, sag-tension and clearance-compliance procedures that let a utility requalify a line at higher ampacity. The search set spans 2015 to mid-2026 and pulls together claims tied to sag-temperature relationships, annealing limits, composite cores, clearance compliance, stringing procedure and cost-per-kilometre framing.
The 454 records in scope split across receiving offices led by the United States, the EPO and Canada, with India, WIPO/PCT and China also represented — a spread consistent with a technology that gets qualified jurisdiction-by-jurisdiction against local grid codes rather than filed once and licensed globally.
Filing trend and technology composition
Two views of the same 454-record set: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017-2026
Filings peaked at 55 in 2017. The tracked 2021-to-2024 window shows a decline from 34 to 6 records, an 82% drop over three years. 2025 and 2026 are shown but should be read as incomplete: publication lags filing by roughly 18 months, so the newest years always understate true filing activity.
IPC subclass composition
H01B (cables, conductors and insulators) appears in 63.7% of the 454 records, and C09D (coatings, paints and inks) in 38.3% — the two largest classes together confirm that conductor hardware and surface treatment are filed as a pair more often than as separate inventions. Because a single record can carry several IPC classes, these shares sum to well over 100% and should not be added together.
Shares are the percentage of the 454 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Overhead Conductors and Line Uprating with Eureka
This page is one run against one query. Ask Eureka your own question about overhead conductors and line uprating and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
Ultra-high voltage fiber composite core overhead conductor (ZA202107741B)
The filing describes an extra-high-voltage overhead conductor built around a fiber composite core with conductive fibers and conductive fillers, layered as an inner and outer composite core beneath an outer conductor. The stated aim is to let the core itself carry current while the fiber-resin composite structure supplies the mechanical strength an overhead line needs, so the design targets both electrical and mechanical requirements in one core rather than trading one off against the other.Filed by Shandong University, dated 2021-12-22.
View full filing| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20140041925A1 | Surface modified overhead conductor | 277 |
| 2 | US7015395B2 | Composite reinforced electrical transmission conductor | 104 |
| 3 | US20040026112A1 | Composite reinforced electrical transmission conductor | 68 |
| 4 | US7752754B2 | Method for increasing the current carried between two high voltage conductor support towers | 51 |
| 5 | US20080173462A1 | Spacer and spacer damper | 40 |
| 6 | US3813772A | Method of forming steel supported aluminum overhead conductors | 39 |
| 7 | US20150353737A1 | Curable two-part coatings for conductors | 38 |
| 8 | US8371028B2 | Method for increasing the current carried between two high voltage conductor support towers | 38 |
| 9 | US20150194240A1 | Coated overhead conductor | 37 |
| 10 | US20150104641A1 | Coated overhead conductor | 28 |
Citation counts favour older filings simply because they have had longer to accumulate citations inside this corpus — treat this as a signal of influence on the field, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from the ranking, the trend and the class composition, aimed at where to file next and where not to.
One assignee dominates the ranked field
The leading assignee's 226 records dwarf the fifth-place holder's 22 and the tenth-place holder's 14 across a 66-company ranking. That gap is wide enough that a new entrant should assume core conductor and coating claims near the top are already dense, and look instead at the long tail of single- or few-filing entrants for open ground.
Filing has pulled back sharply from peak
The 2017 peak of 55 records has not been matched since, and the 2021-to-2024 window shows an 82% decline. Because publication lags filing by around 18 months, 2025 and 2026 figures are not yet reliable evidence of a further slowdown — but the 2021-2024 drop itself is a complete, citable trend.
Coatings claims ride alongside core/conductor claims
H01B (cable and conductor hardware) and C09D (coatings) are the two largest classes by a wide margin over H02G, C08K and the rest. A filing strategy that treats conductor core geometry and surface coating as separate claim sets is filing into the same crowded space twice; treating them as one combined claim may find cleaner ground.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to overhead conductors and line uprating, with the prior art for and against each one.
Who is filing, and where the field is thin
The ranking is dominated by one cable manufacturer with several stable co-filing relationships; smaller and academic filers hold single entries scattered across composite-core and coating variants.
General Cable Technologies leads by a wide margin
The top-ranked assignee's record count is roughly ten times the fifth-place holder's, with stable co-filing pairs pointing to long-running joint development on composite-core conductor lines rather than one-off filings.
Even the largest filers show no recent-year output
Every assignee in the momentum data shows zero filings in the latest tracked year, including the field leader. Read this against the 18-month publication lag rather than as a sign the leaders have stopped working the technology.
A long tail of single- and few-filing entrants
Below the top few positions, the ranking thins quickly to companies and individual inventors with a handful of records each, often tied to a specific material variant — an annealing process, a filler chemistry, a coating formulation — rather than a full conductor system.
| Assignee | Recent year | YoY |
|---|---|---|
| General Cable Technologies Corp. | 0 | — |
| Novota Industries | 0 | — |
| CABLE COATINGS LTD | 0 | -100% |
| NanoAl LLC | 0 | — |
| Arkema Inc. | 0 | — |
| Southwire Co. LLC | 0 | — |
| HUANG JIANPING | 0 | — |
| 3M Innovative Properties Co. | 0 | — |
Where to take this analysis
The landscape points to two practical next steps: checking a specific claim against the dense core/coating space, and scanning the thinner branches for open filing room.
Run a freedom-to-operate check on a composite-core or coating claim
Given how concentrated H01B and C09D filings are around one leading assignee's co-filing network, a specific claim is worth checking against that cluster before drafting.
Explore this in EurekaScan the under-claimed branches for a first filing
Heat-treatment scheduling, misc. functional coatings and clearance-compliance procedures all sit well below the core H01B/C09D density in this dataset.
Explore this in EurekaCommon questions on overhead conductor patents
One assignee holds a clearly dominant position, with 226 records against a fifth-place total of 22 and a tenth-place total of 14 across a 66-company ranking. That gap suggests the leading filer has built a broad claim base around composite-core conductor designs, reinforced by stable co-filing relationships with material and coating partners. A new entrant should treat that filer's portfolio as the baseline to search against before drafting a new composite-core claim.
Filings peaked in 2017 at 55 records and have declined since, with the tracked 2021-to-2024 window showing an 82% drop from 34 to 6 records. That decline is real for the complete years, but publication lags filing by roughly 18 months, so the most recent one or two years in any dataset will always look lower than final activity turns out to be. Read the 2021-2024 figure as the reliable trend, not the still-filling-in years after it.
Cable and conductor hardware claims (IPC class H01B) appear in 63.7% of the 454 records in scope, and coatings, paints and inks claims (C09D) appear in 38.3% of the same set. Installing power and signal cables (H02G) and polymer additive use (C08K) follow at meaningfully lower shares. Because a single record can carry multiple IPC classes, these figures should be read as claim density signals, not as a breakdown that sums to 100%.
ZA202107741B, filed by Shandong University and dated 2021-12-22, claims an extra-high-voltage overhead conductor built around a fiber composite core with both an inner and outer composite layer carrying conductive fibers and fillers. The core itself is designed to conduct electricity while the fiber-resin structure supplies mechanical strength, aiming to meet both electrical and mechanical requirements in a single core rather than splitting them across separate components. Anyone designing a composite-core conductor where the core layer itself carries current, rather than acting purely as a mechanical support around a separate conductive strand, should check this filing directly.
The thinner branches in this dataset sit in heat-treatment scheduling for aged conductor cores (C21D, 4.4% of records), miscellaneous functional coatings beyond emissivity control (C09K, 4.8%), and clearance-compliance stringing procedures, all well below the 63.7% and 38.3% density of the core H01B and C09D classes. These lower-density areas are where a first, well-drafted claim is more likely to clear prior art cleanly. That said, low filing counts in a class can also reflect that the underlying engineering problem is harder to patent distinctly, so a freedom-to-operate check is still worthwhile before committing to a filing strategy there.
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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.