Digital Hydraulic Valve Systems Patents: Top Companies & Trends 2026
- Concentrated but not locked up. the top 5 assignees hold 21.2% of all 349 records in scope, and the top 10 hold 30.7% — leaving most of the field to a long tail of single- and few-filing entrants.
- Filing has cooled from its peak. activity peaked in 2019 at 33 records, and the last complete three-year window (2021 to 2024) shows an 11% decline, though 2025-2026 figures are still filling in due to publication lag.
- Power conversion dominates the claim space. H02M covers 44.1% of all 349 records, more than double the next largest class, so switching and conversion topologies are the most heavily claimed ground in this dataset.
Filing growth compares 2021 (9 records) with 2024 (8) — 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 349 records in scope (CR5), not by the ranked leaders only.
What this dataset covers
This landscape draws on 349 published records matched against claims and abstracts referencing digital hydraulic valve control concepts — flow resolution, switching frequency, valve endurance, pressure ripple, noise generation, fault tolerance and control algorithms. The search terms bridge hydraulic switching control with the power-electronics and digital-control language that increasingly describes it, which is why the technology composition leans heavily on power conversion and grid-systems classes rather than purely mechanical valve classifications.
Records span from 2015 through the 2026 data cut-off, with receiving offices led by the United States, followed by Europe (EPO), WIPO/PCT filings, the United Kingdom and Australia. Because publication typically lags filing by around 18 months, the most recent one to two years in any trend understate real filing activity and should be read as provisional.
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Filing trends and technology composition
Two views of the same 349 records: how filing volume has moved year over year, and how the underlying technology splits across IPC subclasses. Each record can carry more than one class, so class shares add up to more than the record total.
A 2019 peak followed by a cooling trend
Filings ran from 14 records in 2017 up to a peak of 33 in 2019. The last complete three-year comparison, 2021 (9 records) to 2024 (8 records), shows an 11% decline — a real signal, but a modest one, and it should not be extrapolated past 2024 given publication lag on the most recent years.
Power conversion and grid systems lead the claim space
H02M (power conversion) appears in 44.1% of the 349 records and H02J (power supply and grid systems) in 20.1%, together framing this as a power-electronics-adjacent field. Digital data processing (G06F, 8.0%), pulse technique and logic circuits (H03K, 7.2%), and protective circuit arrangements (H02H, 6.3%) form a second tier describing the control and safety layers around the switching hardware.
Shares are the percentage of the 349 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Digital Hydraulic Valve Systems with Eureka
This page is one run against one query. Ask Eureka your own question about digital hydraulic valve systems and every answer comes back with the patent numbers behind it.
Try EurekaA representative record from the corpus
Multiphase DC Power Supply with High Switching Frequency
A multiphase DC power supply with high switching frequency of 1 MHz comprising three parallel-connected three-phase DC power supplies. Each unit uses a boost power factor corrector to convert an AC source to a rectified, filtered DC voltage, an isolation transformer to generate a stable full-wave rectified DC voltage, a switching circuit of three semiconductor switches to regulate the transformer output, and a phase controller managing an interleaved phase across the parallel units.Filed by Chyng Hong Electronic Co., Ltd., published 2017-10-12.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080179602A1 | Fault tolerant light emitters, systems incorporating fault tolerant light emitters and methods of fabricating… | 389 |
| 2 | US4989206A | Disk drive memory | 352 |
| 3 | US4592359A | Multi-channel implantable neural stimulator | 344 |
| 4 | US4914656A | Disk drive memory | 279 |
| 5 | US4989205A | Disk drive memory | 205 |
| 6 | US20070296383A1 | Non-Isolated Bus Converters with Voltage Divider Topology | 193 |
| 7 | US6301130B1 | Modular multi-level adjustable supply with parallel connected active inputs | 183 |
| 8 | US5781419A | Soft switching DC-to-DC converter with coupled inductors | 181 |
| 9 | US6009000A | Shared-bus current sharing parallel connected current-mode DC to DC converters | 169 |
| 10 | GB2482653A | Photovoltaic power generation system | 165 |
Citation counts reflect influence within the searched corpus and favour older records; they are not a measure of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers actually mean for filing strategy
Three readings of the same dataset, aimed at where a filing or freedom-to-operate decision would actually land.
Leadership is real but not dominant
The leader holds 24 records and the field drops to 9 by fifth place and 6 by tenth — a real gap at the top but nowhere close to a monopoly. Most of the 100 ranked assignees appear as single- or few-filing entrants, which is typical of a field still absorbing entrants from adjacent power-electronics disciplines.
Post-peak cooling, not collapse
Filing peaked in 2019 at 33 records and has settled at a lower plateau since. The 2021-2024 comparison is the most reliable recent signal available; years after 2024 are still filling in and should not be read as confirming further decline.
Switching topology claims dominate
Power conversion (H02M) alone touches nearly half of all 349 records, well ahead of grid systems (H02J, 20.1%) and every control or measurement class below it. A filer targeting this space is entering ground that is already densely claimed on the conversion side, with comparatively lighter coverage on the digital control and fault-tolerance layers.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to digital hydraulic valve systems, with the prior art for and against each one.
Assignee landscape and where activity is thin
The ranking covers 100 assignees across the 349 records in scope. Recent-year momentum for the leading assignees shows no activity in the latest year across the names checked, consistent with the post-2024 publication lag rather than a sudden stop.
A modest lead, not a moat
The top assignee's 24 records place it well ahead of fifth place at 9, but 24 out of 349 records is still a small fraction of the field. Storage and power-conversion technology firms feature prominently near the top of the ranking, reflecting the dataset's lean toward power-electronics-adjacent claim language.
A shallow drop-off after the leader
The gap from fifth (9 records) to tenth (6 records) is gradual rather than a cliff, suggesting a genuine cluster of active mid-tier filers rather than one dominant firm surrounded by a thin field.
Co-filing is rare in this dataset
Only four co-assignee pairings appear across the corpus, each linking a company to a named inventor rather than to another corporate entity. That points to a field where IP is being built largely in-house rather than through joint filings or cross-licensing arrangements.
| Assignee | Recent year | YoY |
|---|---|---|
| Storage Technology Corporation | 0 | — |
| GE Energy Power Conversion Technology Ltd (GB) | 0 | — |
| Crown International Inc. | 0 | — |
| Wisconsin Alumni Research Foundation | 0 | — |
| General Electric Co. | 0 | — |
| Huawei Digital Power Technology Co., Ltd. | 0 | — |
| Finnish Railways (VR Group) | 0 | — |
| Vacon Oy | 0 | — |
Turning this landscape into a filing decision
A landscape view tells you where the crowd is; the next step is checking a specific claim idea against it.
Map a draft claim against the ranked assignees
Run a specific control-algorithm or switching-sequence claim against the leaders identified here before drafting further, since dense classes like H02M carry the highest collision risk.
Explore in Patsnap EurekaTrack the mid-tier filers, not just the leader
The shallow drop-off from fifth to tenth place suggests several active competitors worth monitoring individually rather than treating the field as a single-leader market.
Set up assignee monitoringRe-check white space after the next publication cycle
Because 2025-2026 filings are still emerging, revisit the under-claimed branches in six to twelve months once more of the recent cohort has published.
Revisit this landscapeFrequently asked questions
Across the 349 records in this dataset, one assignee leads with 24 records, dropping to 9 records at fifth place and 6 at tenth. The top 5 assignees together hold 21.2% of all records and the top 10 hold 30.7%, meaning leadership exists but is far from dominant. The remaining majority of filings are spread across a long tail of the 100 ranked assignees, many with only one or two records, so this is not a field controlled by a small handful of players.
Filing activity peaked in 2019 at 33 records and has since settled lower, with the most recent reliable comparison — 2021 to 2024 — showing an 11% decline. Filings in 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so those years should not yet be read as confirming further decline. The honest read is a cooling trend after a 2019 peak, not a collapse.
Power conversion, classified under IPC subclass H02M, appears in 44.1% of the 349 records, making it by far the most heavily claimed area. Power supply and grid systems (H02J) follow at 20.1%, with digital data processing, pulse technique and logic circuits, and protective circuit arrangements each covering smaller but notable shares. This mix shows the field is described more through power-electronics switching language than through purely mechanical hydraulic valve terminology.
Relative to the dense power-conversion core, branches like fault-tolerant switching sequencing, pressure-ripple compensation algorithms, and valve-endurance diagnostic circuits carry lighter direct coverage in this dataset. These sit adjacent to the heavily claimed H02M and H02J territory but address specific control and reliability problems that are not yet saturated. A first claim in these areas would need to tie a concrete algorithmic step to a measurable outcome, such as a ripple threshold or a defined fault-isolation sequence, to stand apart from the existing switching-topology art.
The United States leads with 119 filings, followed by Europe via the EPO at 62, WIPO/PCT filings at 36, the United Kingdom at 19, and Australia at 18. This distribution indicates the field is prosecuted primarily in the US and Europe, with PCT filings suggesting a meaningful share of applicants are pursuing multi-jurisdiction protection rather than filing in a single home market only.
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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.