Regenerative Braking Patents: Top Companies & Filing Trends 2026
- Filing nearly quadrupled in three years. 2021 to 2024 filings rose from 28 to 102 records, a +264% jump, before the two most recent years understate activity due to publication lag.
- The top of the field is concentrated but not closed. The five leading assignees account for 45.3% of all 841 records in scope, and the leading ten for 57.4% — leaving a substantial long tail of single- and few-filing entrants.
- Power electronics classes rival the brake class itself. B60L electric vehicle propulsion touches 46.7% of records, while B60T vehicle brakes proper sits at just 12.5% — most of the claim activity is happening in the drivetrain and power conversion layers, not the brake hardware.
Filing growth compares 2021 (28 records) with 2024 (102) — 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 841 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Regenerative and electrodynamic braking recovers kinetic energy during deceleration and returns it to a battery, capacitor, or supply line rather than dissipating it as heat through friction alone. The engineering problem sits at the intersection of brake blending control — deciding how much of a stop is handled electrically versus mechanically — and power electronics, which governs how much energy the traction inverter and grid or line can actually absorb. This dataset spans 841 records filed or published between 2015 and mid-2026, covering both automotive and rail applications where terms like line receptivity, adhesion limit, and rheostatic backup appear in claims.
The field pulls together vehicle dynamics, motor control, and grid interaction, which is why a single record commonly carries classes spanning propulsion, batteries, and power conversion at once. Reading the technology mix requires treating these as overlapping claim territories rather than a single ladder of maturity.
Filing trends and technology composition
Two views of the same 841 records: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017–2026
Filings climbed from 39 in 2017 to a peak of 102 in 2024, with 2021's 28 to 2024's 102 marking a +264% run. The 2025 and 2026 figures (down to 15 in the partial latest year) should be read as incomplete rather than as a slowdown, since publication typically lags filing by around 18 months.
Technology composition by IPC subclass
B60L (electric vehicle propulsion) appears in 46.7% of the 841 records, well ahead of H01M batteries at 24.4% and H02M power conversion at 14.6%. B60T, the class most directly tied to brake hardware, appears in only 12.5% of records — a reminder that most patent activity in this space is being claimed through the electrical and control layers rather than the mechanical brake itself. Because records can carry multiple classes, these shares sum to well over 100% of the record total.
Shares are the percentage of the 841 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Regenerative and Electrodynamic Braking with Eureka
This page is one run against one query. Ask Eureka your own question about regenerative and electrodynamic braking and every answer comes back with the patent numbers behind it.
Try EurekaFoundational and highly cited filings
US4199195A — Dynamic/friction brake blending control system
A dynamic/friction brake blending control system in which a brake pipe pressure responsive control valve device provides a friction brake pressure connected to the vehicle brake cylinders via a blending relay valve device with a self-lapping piston valve assembly, spring-biased to a brake application position that relays friction brake pressure unmodulated to the brake cylinders in the absence of dynamic brake effort.Filed by Westinghouse Air Brake Company, granted 1980-04-22 — an early foundational filing on mechanical blending logic that predates modern power-electronic blending control.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20060152085A1 | Power system method and apparatus | 441 |
| 2 | US20140304025A1 | Managing energy assets associated with transport operations | 192 |
| 3 | US5511859A | Regenerative and friction brake blend control | 186 |
| 4 | US20200317083A1 | Electric concrete vehicle systems and methods | 183 |
| 5 | US6484830B1 | Hybrid electric vehicle | 183 |
| 6 | US20200274375A1 | Power distribution and circuit protection for a mobile application having a high efficiency inverter | 174 |
| 7 | US20200316816A1 | Electric concrete vehicle systems and methods | 156 |
| 8 | US20130204443A1 | Managing energy assets associated with transport operations | 141 |
| 9 | US20210031649A1 | Electric vehicle with accessory module | 140 |
| 10 | US20070159007A1 | Energy storage system for electric or hybrid vehicle | 137 |
Citation counts inside a searched corpus favour older filings; treat them as a measure of influence on later work, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the data means for filing strategy
Three patterns worth acting on rather than just noting.
The field accelerated sharply, then the record thins out from lag
Filings rose from 28 in 2021 to 102 in 2024. The drop to 15 in the most recent partial year is a publication-lag artefact, not a real contraction — treat 2024 as the last complete year for trend reading.
A concentrated top with room underneath
The five leading assignees hold 45.3% of all 841 records, and the leading ten hold 57.4%. That leaves over 40% of filings spread across a long tail — the field is not closed to new entrants, particularly outside the leaders' core claim territory.
Claims cluster in propulsion and power electronics, not brake hardware
B60L electric vehicle propulsion touches nearly half of all records, while B60T vehicle brakes touches only an eighth. Blending logic and energy-routing claims are being fought over in the drivetrain and inverter layers.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to regenerative and electrodynamic braking, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked leaders span both automotive OEMs and rail/traction specialists, but recent-year momentum among several familiar names has gone flat rather than continuing to climb.
Several established filers show no recent-year activity
More than one of the assignees active earlier in the window shows zero filings in the latest year, and at least one shows a -100% year-on-year drop from a small base. This is consistent with publication lag rather than necessarily withdrawal, but it also means the current leaderboard understates who is actually active today.
The leading ten hold just over half the field
With 483 of 841 records concentrated among ten assignees, most white space sits outside their core claims rather than in direct competition with them — a reason to map adjacent branches before contesting the centre.
Co-filing is limited and clustered around one organisation
Only ten co-assignee pairs appear across the dataset, and the strongest pairs all involve the same corporate entity paired with different named inventors — suggesting joint filing here is more an internal inventor-attribution pattern than cross-company collaboration.
| Assignee | Recent year | YoY |
|---|---|---|
| BorgWarner US Technologies LLC | 2 | -50% |
| Toyota Jidosha KK (Toyota Motor Corporation) | 0 | — |
| General Electric Co | 0 | — |
| Delphi Intellectual Property Ltd | 0 | — |
| Ford Global Technologies LLC | 0 | -100% |
| GM Global Purchasing LLC | 0 | -100% |
| MATTER MOTOR WORKS PTE LTD | 0 | -100% |
| Oshkosh Corporation | 0 | — |
Where to take this next
The dataset points to specific follow-up questions rather than a single conclusion.
Watch the 2025–2026 filings as they resolve
Because publication lags filing by roughly 18 months, the apparent decline after 2024 will fill in over the next reporting cycles. Revisit the trend before drawing conclusions about a slowdown.
Track filing trends in EurekaMap claims in the under-claimed branches
Line receptivity estimation and adhesion-limit adaptive blending show comparatively thin filing density relative to core blending-control claims, making them worth a focused freedom-to-operate check before committing engineering resources.
Explore white space in EurekaCheck citation influence against current filing activity
The most-cited records in this corpus skew older; pair citation counts with recent-year assignee momentum before treating an old filing as still commercially central.
Compare citations and momentum in EurekaCommon questions on this landscape
The dataset ranks 100 assignees across 841 records, with the leading company alone accounting for 181 records. The five leading assignees together hold 45.3% of all 841 records in scope, and the leading ten hold 57.4%. That said, the ranking is not a top-50 or top-100 industry list — it is the complete set the data endpoint returns, and over 40% of filings sit outside the ten leaders, spread across a long tail of smaller filers.
Filings grew sharply between 2021 and 2024, from 28 to 102 records, a +264% increase. The apparent drop-off after 2024, down to 15 in the most recent partial year, is best read as a publication-lag effect rather than a genuine slowdown, since patent publication typically trails filing by around 18 months. Treat 2024 as the most recent year with a reasonably complete picture.
B60L, the IPC subclass covering electric vehicle propulsion, appears in 46.7% of the 841 records in scope, making it the single largest technology cluster. H01M (batteries and cells) follows at 24.4%, and H02M (power conversion) at 14.6%. Notably, B60T, the subclass for vehicle brakes specifically, appears in only 12.5% of records, indicating that most of the inventive activity is happening in the electrical and control systems around the brake rather than in brake hardware itself.
US4199195A, filed by Westinghouse Air Brake Company and granted in 1980, describes a dynamic/friction brake blending control system using a self-lapping piston valve assembly to relay friction brake pressure to brake cylinders when dynamic brake effort is absent. It is a mechanical, hydraulic-pneumatic approach to blending rather than a power-electronic one, so it constrains valve-based blending architectures more than it constrains modern software-driven blending control using traction inverters. Anyone designing a mechanical fallback or backup braking path should review its claims closely; anyone working purely in inverter-based blending logic has more room.
Filing density is comparatively thin in areas like line receptivity estimation, rheostatic backup switching logic, and adhesion-limit adaptive blending, relative to the dense core claims around basic brake blending control and inverter-based energy routing. These adjacent branches sit close enough to the core technology to be commercially relevant but have not attracted the same concentration of filings from the leading assignees. A first claim in these areas would need to specify the measurement or control method precisely enough to differentiate from the broader blending-control prior art already on record.
Research Regenerative and Electrodynamic Braking in depth with Eureka
Go past this page: query the whole regenerative and electrodynamic braking corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.