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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/motor-magnet-wire-and-insulation-systems-for-traction-motors-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Metals & AlloysMotor Magnet Wire and Insulation Patents for Traction Motors
- 65 families since 2015, peaking at 13 in 2020 and easing since — filing growth here is flat, not accelerating.
- H01B carries 62 of 65 records, with H02K motor-integration claims layered on top in under half of that set.
- United States leads receiving offices with 26 filings, ahead of the EPO at 16 and PCT filings at 9.
65
Published Records
89%
Top-5 Share of All Records
-33%
3-Yr Growth (lag-adjusted)
US
Leading Jurisdiction
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks patent families addressing magnet wire and winding insulation systems built for traction motor duty: constructions rated for partial discharge inception voltage under inverter surge, high slot fill factor windings, and insulation systems classed by thermal rating. The search combines wire and winding terminology with traction-specific qualifiers, then filters to H01B, H02K and C08G73 so that generic wire or generic motor filings without the insulation-performance angle fall out of scope.
The set is small and concentrated: 65 published families across an eleven-year window, with claims sitting overwhelmingly in cable and conductor classifications rather than in motor architecture or polymer chemistry alone. That concentration is itself a signal — insulation performance, not motor topology, is where the claim activity sits.
Filing activity by year, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Motor Magnet Wire and Insulation Systems for Traction Motors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The data
Filing trend and technology composition
Two views of the same 65-family dataset: how filing volume has moved year over year, and how those filings distribute across IPC subclasses.
A peak in 2020, then a plateau
Filings rose from zero in 2017 to a peak of 13 in 2020, sat at 7 by the 2022 midpoint, and show 3 filings in the most recent partial year. Because publication typically lags filing by around 18 months, the last one to two years will always look thinner than they eventually turn out to be — but the shape from 2020 onward is a slowdown, not a ramp.
H01B dominates; H02K and H01F ride alongside
62 of 65 records carry an H01B conductor/insulator classification, meaning nearly the entire dataset is anchored in wire and insulation claims rather than broader motor design. H02K (31 records) and H01F (13) show where insulation claims get tied to motor or magnetic-circuit integration, while B32B (10) and the polymer-additive classes C08K, C09D and C08L mark the smaller cluster of filings built around layered constructions and coating chemistry.
Shares are the percentage of the 65 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Motor Magnet Wire and Insulation Systems for Traction Motors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Representative filing and most-cited prior art
Representative filing
Magnet wire with high partial discharge inception voltage (PDIV)
REA MAGNET WIRE COMPANY, INC.
An insulated wire includes insulation having organic filler particles distributed throughout a polymer matrix. The filler particles may be a fluoropolymer with a low relative permittivity and a high dielectric strength. This configuration achieves improved PDIV and dielectric characteristics for a given thickness of insulation, as compared to a comparable polymer insulation lacking the filler particles. The resulting wire may be used for high-voltage and severe-duty applications, preserving or improving performance while minimizing insulation thickness for additional spatial efficiency.Filed by REA Magnet Wire Company, Inc., published 2022-08-04.
Most-cited records in this set
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6140590A | Stator winding insulation | 53 |
| 2 | CN102568663A | 高温高频电磁线和制造方法 | 16 |
| 3 | US4379807A | Magnet wire for hermetic motors | 16 |
| 4 | US20120152590A1 | High Temperature High Frequency Magnet Wire and Method of Making | 13 |
| 5 | US20200251243A1 | Magnet Wire With Improved Enamel Adhesion | 10 |
| 6 | US20180322980A1 | Surface Treating Magnet Wire Enamel Layers To Promote Layer Adhesion | 10 |
| 7 | US10796820B2 | Magnet wire with corona resistant polyimide insulation | 7 |
| 8 | WO2019018214A1 | Systems and methods for forming magnet wire insulation | 7 |
| 9 | US20050042451A1 | Magnet wire for motors coupled to speed variators of improved resistance to voltage peaks and manufacturing p… | 7 |
| 10 | US11004575B2 | Magnet wire with corona resistant polyimide insulation | 6 |
Citation counts accumulate over time, so older filings such as the 1982 and 2000 records lead the table by default — that reflects age and searched-corpus visibility more than 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.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Motor Magnet Wire and Insulation Systems for Traction Motors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three things stand out once family counts, IPC spread and receiving-office data are read together.
Filing pace
13 in 2020, 3 latest year
peak vs. most recent
Volume has plateaued since the 2020 peak
A rise from zero in 2017 to 13 filings in 2020 followed by a decline to 7 at the 2022 midpoint suggests the initial wave of PDIV and thermal-class insulation claims has largely been staked out. New entrants now face a smaller, more defined claim space rather than an open field.
Read against an 18-month publication lag, not a hard ceiling.
Classification spread
62 of 65 in H01B
conductor & insulator class
Claims cluster on the wire, not the motor
With 62 of 65 records classified under H01B against 31 under H02K, the dataset shows insulation and conductor construction as the primary claim target, with motor-level integration treated as a secondary layer rather than the main inventive contribution.
Polymer chemistry classes (C08K, C09D, C08L) remain a small fraction of the whole.
Jurisdiction
US 26, EPO 16, PCT 9
top receiving offices
Filing strategy is US-anchored with a European second track
The United States receives the largest share of filings at 26, with Europe at 16 and WIPO PCT applications at 9. Canada, India and Austria each register single-digit counts, indicating protection strategies built around US and European markets first, with broader international coverage pursued more selectively.
India's 4 filings and Canada's 5 mark the thinner secondary markets.
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to motor magnet wire and insulation systems for traction motors, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Motor Magnet Wire and Insulation Systems for Traction Motors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the field is still open
Assignee activity in this dataset is led by names with a long filing history rather than new momentum; recent-year data shows most established filers quiet in the latest period while one assignee continues to file.
Momentum
3 filings, latest year
Essex Solutions USA LLC
One assignee still active while others go quiet
Essex Solutions USA LLC recorded 3 filings in the most recent year, while other tracked assignees — including Essex Group entities, General Electric and REA Magnet Wire — show zero filings in that same window in this dataset.
A quiet recent year does not confirm withdrawal; it may reflect publication lag.
Concentration
65 families total
across the full window
A small, name-recognisable applicant set
The assignee ranking is drawn from a modest pool of 65 total families, meaning a handful of established magnet-wire and insulation specialists account for a large share of the documented activity rather than a broad field of new entrants.
Consistent with a mature, specialist supplier base rather than a fast-growing one.
Geography
US 26 filings
leading receiving office
US filing strength points to a US-centric supplier base
The concentration of receiving-office activity in the United States, well ahead of Europe and PCT routes, aligns with the presence of US-headquartered and US-subsidiary magnet wire producers among the most active assignees.
Watch EPO filings for signs of European entrants building parallel coverage.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| ESSEX SOLUTIONS USA LLC | 3 | — |
| Essex Furukawa Magnet Wire USA LLC | 0 | — |
| Essex Group LLC | 0 | — |
| General Electric Company | 0 | — |
| REA MAGNET WIRE CO INC | 0 | — |
| REA Magnet Wire Company, Inc. | 0 | — |
| Yazaki Corporation | 0 | — |
| Kondamax Services Company | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Motor Magnet Wire and Insulation Systems for Traction Motors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's next
Turning this landscape into a filing decision
The dataset points to where claim space is dense and where it thins out. The next step is narrowing that down to a specific composition, construction or process claim.
Check freedom-to-operate on PDIV insulation constructions
With the most-cited prior art clustering around high-temperature, high-frequency magnet wire and PDIV performance, any new insulation composition claim should be checked against that specific cluster before drafting.
Run a freedom-to-operate check in EurekaMap the under-claimed branches against your own roadmap
Fluoropolymer filler systems, hairpin corner insulation and multi-layer slot liners show fewer records than the core H01B cluster — worth confirming whether that is open space or simply unindexed activity.
Explore white space in EurekaTrack Essex Solutions USA LLC's recent filings closely
As the one assignee still filing in the latest year while peers show no recent activity, its filings are the clearest signal of where active claim-staking continues.
Monitor assignee activity in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Motor Magnet Wire and Insulation Systems for Traction Motors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on magnet wire and insulation patents
The dataset of 65 families shows activity concentrated among a small set of established magnet-wire and insulation specialists rather than a broad field of new entrants. Recent-year filing data shows Essex Solutions USA LLC as the assignee still actively filing, with 3 filings in the latest year, while other long-standing names in the space show no filings in that same window. This pattern is typical of a mature supplier base defending existing positions rather than a market still being staked out by newcomers.
Filings in this space fall predominantly under H01B (cables, conductors and insulators), which covers 62 of the 65 records tracked. H02K (electric motors and generators) appears in 31 records where insulation claims tie into motor construction, and H01F (magnets, inductors and transformers) appears in 13. Smaller clusters sit in B32B for layered products, and in C08K, C09D and C08L for polymer additive and coating chemistry — useful search terms if the H01B cluster returns too much noise.
Filing volume rose from zero in 2017 to a peak of 13 in 2020, then eased to 7 by 2022 and shows only 3 filings in the most recent partial year. Because patent publication typically lags actual filing by around 18 months, the last one to two years will understate true activity, but the trend since 2020 reads as a plateau or mild decline rather than continued growth. Anyone reading this trend for market signal should weight the 2020-2022 period more heavily than the most recent bars.
WO2022165301A1, filed by REA Magnet Wire Company, Inc. and published 2022-08-04, covers insulated wire with organic filler particles — specifically a fluoropolymer with low relative permittivity and high dielectric strength — distributed through a polymer matrix. The stated benefit is improved partial discharge inception voltage (PDIV) and dielectric strength for a given insulation thickness, intended for high-voltage and severe-duty motor applications. Anyone designing a filler-loaded insulation system for PDIV performance should review this filing's claim scope before finalising a composition.
The smaller IPC clusters point to it: B32B layered-product claims, C08L thermal-class polymer blends, and C09D coating chemistries each carry single-digit-to-low-double-digit record counts compared to the 62-record H01B core. Sub-areas such as hairpin conductor corner-radius insulation and inverter-surge-rated enamel coatings show up at the edges of the dataset rather than at its centre. That does not guarantee open claim space — it may simply mean those angles are filed under different keywords — but they are the areas worth a dedicated freedom-to-operate search before assuming clearance.
Answers are grounded in the same dataset. Derived from a Patsnap search on Motor Magnet Wire and Insulation Systems for Traction Motors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.