Hydraulic-Electric Hybrid Boom Systems Patents: Leaders & Gaps 2026
- One filer dominates a small field. the leading assignee holds 16 of the 25 records in scope, with the remaining four ranked companies filling out the rest of the ranking.
- Filing has gone quiet, not up. activity peaked at 3 records in 2018 and fell -100% from 2021 (2 records) to 2024 (0), the last year publication lag lets us treat as complete.
- Claims cluster on the excavator boom itself. 92.0% of the 25 records sit in E02F (excavating and earth moving) and 64.0% also touch F15B (fluid-pressure actuators), leaving little room outside that overlap.
Filing growth compares 2021 (2 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 25 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Hydraulic-electric hybrid boom systems recover the potential energy released when a construction machine’s boom lowers under load, storing it — typically in a hydraulic accumulator — for reuse during the next lift. The search underlying this page combines drive-architecture language (hydraulic electric hybrid drive, electro hydraulic boom actuation) with claim-level terms specific to this problem, such as recoverable energy fraction, accumulator, and retrofit feasibility. That combination narrows the corpus to 25 published records, a small and tightly scoped field rather than a broad hybrid-drivetrain category.
Because the field is small, individual filers move the concentration figures more than they would in a larger art. The ranking, trend and classification data below should be read with that in mind: a handful of families can shift a percentage point noticeably.
Filing trend and technology composition
Two views of the same 25-record corpus: how filing has moved year over year, and which IPC subclasses the claims fall under.
A short, front-loaded filing history
Filing rose to a peak of 3 records in 2018, then declined; by the last complete year (2024) annual output had dropped -100% from the 2021 level of 2 records. Records published in 2025 and 2026 are still incomplete because publication typically lags filing by roughly 18 months, so the apparent quiet in the most recent years should not be read as the field ending.
Concentrated in two adjacent classes
92.0% of the 25 records carry an E02F (excavating and earth moving machinery) classification and 64.0% also carry F15B (fluid-pressure actuators and systems) — expected given that boom energy recovery is inherently an excavator-plus-hydraulics problem. Because records can carry multiple classes, these shares are not mutually exclusive and add to more than 100%.
Shares are the percentage of the 25 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hydraulic-Electric Hybrid Boom Systems with Eureka
This page is one run against one query. Ask Eureka your own question about hydraulic-electric hybrid boom systems and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this field
US20190292752A1 — Boom potential energy recovery of hydraulic excavator
A hydraulic system for recovering potential energy of a load implement of a mobile construction vehicle. First and second actuators couple to the load implement for raising and lowering it, with control valving switching between two positions: one that directs fluid from an actuator to an accumulator during lowering, charging it, and one that directs stored fluid from the accumulator back to the actuators.Filed by Parker-Hannifin, this filing sits at the centre of the corpus's most-cited cluster and defines the accumulator charge/discharge valving architecture that recurs across the other top-cited records.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2017031066A1 | Boom potential energy recovery of hydraulic excavator | 14 |
| 2 | US20180216317A1 | Boom potential energy recovery of hydraulic excavator | 10 |
| 3 | CN108055856A | 液压挖掘机的动臂势能回收 | 10 |
| 4 | US20210148087A1 | Boom potential energy recovery of hydraulic excavator | 2 |
| 5 | US10941542B2 | Boom potential energy recovery of hydraulic excavator | 2 |
| 6 | CN111043089A | 一种机械液压复合式挖掘机动臂势能回收及再利用系统 | 2 |
| 7 | CN112627281A | 液压挖掘机的动臂势能回收 | 2 |
| 8 | US10358797B2 | Boom potential energy recovery of hydraulic excavator | 2 |
| 9 | US11225776B2 | Boom potential energy recovery of hydraulic excavator | 1 |
| 10 | EP3536865B1 | Boom potential energy recovery of hydraulic excavator | 1 |
Citation counts reward older filings simply for having had more time to be cited; treat them as a signal of influence within this corpus, not as a measure of current technical importance.
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
Three findings that shape where a new filing would sit relative to existing claims.
One company controls most of a small field
The leading assignee accounts for 16 of the 25 records in scope, with the top five ranked companies together covering all 25 records (100.0%) — there is effectively no filer outside this ranked group. A new entrant is not competing against a diffuse field; it is competing against one dominant portfolio.
Activity has gone quiet at the top
Recent-year momentum by assignee shows the tracked filers at 0 in the latest year, consistent with the corpus-wide drop from 2 records in 2021 to 0 in 2024. Because 2025-2026 publications are still arriving, this reads as a pause rather than a confirmed end to filing.
Europe and the US carry most of the filing
Receiving-office counts put Europe (EPO) at 9 and the United States at 8, with China at 4 and India at 2 — a field prosecuted mainly through European and US offices rather than concentrated in a single jurisdiction.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hydraulic-electric hybrid boom systems, with the prior art for and against each one.
Who is active, and where they are not
The ranked assignee list is short — five companies in total — and dominated by one industrial hydraulics specialist, with academic and equipment-maker filers holding single-digit counts.
A hydraulics specialist holds most of the corpus
The top-ranked assignee's 16 records span the accumulator charge/discharge architecture that also anchors the most-cited filings in this dataset, making its claim set the one any new filer must map against first.
Academic and regional filers hold narrow positions
The remaining ranked assignees, including two Chinese universities and a regional crane-equipment maker, each hold small counts, suggesting narrower or more specific claim scopes rather than broad architecture patents.
No ranked assignee is currently active
Recent-year momentum data shows the tracked assignees, including one university at -100% YoY, all at zero filings in the latest year — consistent with the corpus-wide filing pause rather than a single company exiting the space.
| Assignee | Recent year | YoY |
|---|---|---|
| Parker Hannifin Corporation | 0 | — |
| Xuzhou College of Industrial Technology | 0 | — |
| Taiyuan University of Science and Technology | 0 | -100% |
Where to take this analysis
The dataset points to a narrow, concentrated field with one clear incumbent and several under-explored branches.
Map claims against the leading portfolio
Before drafting new claims in accumulator-based boom recovery, check them directly against the leading assignee's 16-record portfolio, since it anchors the most-cited filings in this corpus.
Explore assignee portfolios in Eureka →Watch for the 2025-2026 filing catch-up
Because publication lags filing by roughly 18 months, the apparent -100% drop through 2024 may reverse as 2025-2026 records continue to publish; re-check the trend before concluding the field has gone cold.
Track live filing updates in Eureka →Probe the electric-storage and retrofit branches
The gate chips above mark sub-areas with little claim density in this corpus; a first filing there would face less crowded prior art than a new accumulator-valving claim.
Run a white-space search in Eureka →Common questions about this landscape
One assignee holds 16 of the 25 records in scope, making it the clear leader in this specific, narrowly-scoped field. The remaining four ranked companies, including two Chinese universities and a crane-equipment maker, hold much smaller counts. Together the five ranked assignees account for all 25 records in scope, meaning there is effectively no filing activity outside this small group.
Filing peaked at 3 records in 2018 and had fallen -100% by 2024 compared with the 2 records filed in 2021, the last year that can be treated as complete. However, patent publication typically lags filing by around 18 months, so 2025 and 2026 records are still arriving and should not yet be read as confirming a permanent decline. Anyone tracking this space should revisit the trend in a year or two rather than treating the current dip as final.
It refers to hydraulic systems that capture the energy released when a boom or load implement lowers, rather than dissipating it as heat through a control valve. Typically this involves control valving that redirects hydraulic fluid to an accumulator during lowering, charging it, and back to the actuators during the next lift, as described in the representative filing US20190292752A1. Some approaches also explore electric storage as an alternative to purely hydraulic accumulation, though that branch shows less claim density in this dataset.
92.0% of the 25 records in scope carry an E02F classification, covering excavating and earth-moving machinery, and 64.0% also carry F15B, covering fluid-pressure actuators and systems. Because a single record can carry multiple classifications, these two figures overlap rather than sum to 100%. The heavy overlap between the two classes reflects that boom energy recovery is inherently a combined excavator-and-hydraulics problem rather than a general drivetrain topic.
The dataset's most-cited records cluster tightly around accumulator charge/discharge valving architectures, leaving branches like electric-storage alternatives, retrofit kits for existing booms, and multi-actuator recovery control logic comparatively under-claimed. A first filing in one of these adjacent branches would face less crowded prior art than a new claim on the core accumulator-valving mechanism. Given the field's small size — 25 records total — even a handful of new filings in an under-claimed branch could meaningfully shift the landscape.
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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.