Clock Synchronization Patents: Who Leads, Where the Gaps Are 2026
- Concentrated at the top. the leading five assignees hold 45.1% of all 297 records in scope, and the leading ten hold 73.4% — a narrow group has shaped the core claim space.
- Filing has plateaued, not accelerated. activity peaked at 39 filings in 2022 and has not exceeded that midpoint since, suggesting the core protocol claims are largely staked out.
- Classification skews toward multiplexing, not radio. H04J covers 52.9% of records versus 24.2% for H04W, meaning the dominant claim activity sits in synchronization-over-Ethernet transport rather than wireless timing.
What this dataset covers
This landscape covers 297 published records matching precision time protocol, clock synchronization, holdover and asymmetry-compensation language in title, abstract or claims, filed between 2015 and mid-2026. The search string targets hardware timestamping requirements and synchronization error budgets specifically, so the corpus is narrower than general timing or telecom patents — it isolates the engineering problem of keeping distributed clocks aligned across a network rather than clock circuitry in isolation.
Publication lags filing by roughly 18 months, so the 2025-2026 filing counts in the trend chart understate actual recent activity. Family-level counting is used throughout to avoid inflating totals from continuations or multi-jurisdiction refiling of the same invention.
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Filing trend and technology composition
Two views of the same 297 records: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017-2026
Filings rose from 3 in 2017 to a peak of 39 in 2022, then held flat or declined through the most recent complete years. The 2026 figure is partial due to publication lag and should not be read as a drop in activity.
IPC subclass composition
H04J (multiplex communication) appears in 52.9% of the 297 records, well ahead of H04L (30.0%) and H04W (24.2%). Because records carry multiple classes, these shares sum to more than 100% — the pattern shows where claim density concentrates, not a partition of the corpus.
Shares are the percentage of the 297 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Clock Synchronization in Industrial Networks with Eureka
This page is one run against one query. Ask Eureka your own question about clock synchronization in industrial networks and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited records
US20250184026A1 — Clock synchronization assurance method and apparatus
Filed by Huawei Technologies, this record describes a clock management network element that receives a generalized precision time protocol (gPTP) synchronization request identifying a target user plane function and a target terminal device, then resolves clock offset between that user plane function and the access network device providing its timing when the two clocks are not aligned.Published 2025-06-05 — recent enough that its influence on later filings is not yet visible in citation data.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20110200051A1 | Ethernet network synchronization systems and methods | 139 |
| 2 | US7613212B1 | Centralized clock synchronization for time division multiplexed traffic transported over Ethernet networks | 123 |
| 3 | US20150318941A1 | Method for robust PTP synchronization with default 1588v2 profile | 113 |
| 4 | US6714563B1 | Network clock synchronization scheme | 112 |
| 5 | US20150071309A1 | Method and devices for frequency distribution | 103 |
| 6 | US20140064303A1 | Methods and devices for clock synchronization | 97 |
| 7 | US20160277138A1 | PTP over IP in a network topology with clock redundancy for better PTP accuracy and stability | 84 |
| 8 | US20200076439A1 | Apparatus and methods for system clock compensation | 81 |
| 9 | US20190007055A1 | Apparatus and methods for compensation of signal path delay variation | 81 |
| 10 | US20210006344A1 | Method, system, and device for seamless fault tolerant clock synchronization in a vehicle communication system | 75 |
Citation counts favour older filings simply because they have had more time to accumulate citations within this searched corpus; treat them as a signal of influence on subsequent filers, not of current technical relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from the concentration, trend and classification figures above.
A narrow group set the terms of the core claims
With the top ten assignees holding 218 of 297 records, most of the foundational protocol and timestamping claims are already staked. New entrants filing broad PTP or holdover claims are likely to run into prior art from this group rather than open ground.
Filing has plateaued since the 2022 peak
Several of the most active historical filers show zero filings in the latest tracked year, including year-over-year declines of -100% for some. Combined with publication lag, this reads as a maturing core rather than a retreat from the space.
Wireline transport synchronization outweighs wireless timing claims
The dominant classification is multiplex communication (H04J), nearly double the share of wireless networks (H04W). Firms building 5G or industrial-wireless timing products should note that the more contested claim space sits in Ethernet-style transport synchronization, not the radio layer.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to clock synchronization in industrial networks, with the prior art for and against each one.
Who is filing, and where they are not
The assignee ranking spans 77 companies drawn from the full record set. A handful of telecom infrastructure and chip vendors dominate, alongside university-linked filers pursuing joint claims with regional carriers.
Telecom infrastructure vendors anchor the top of the ranking
The leading assignee holds 37 of the 297 records, roughly 12% of the corpus on its own. Fifth place holds 22 and tenth place holds 13, showing a steep drop-off rather than a gradual tail.
Regional carrier-university pairs file jointly on a recurring basis
The strongest co-assignee pairs link a Gulf-region telecom operator with both a UK carrier and a regional university's science and technology research arm, appearing across multiple joint filings. This pattern suggests coordinated regional R&D programmes rather than incidental overlap.
Several historical leaders show no recent-year output
Multiple assignees that built large historical portfolios, including two of the largest filers by volume, show zero filings in the latest tracked year with year-over-year declines recorded at -100% for some. This is consistent with a maturing core claim set combined with normal publication lag.
| Assignee | Recent year | YoY |
|---|---|---|
| Telefonaktiebolaget LM Ericsson (Sweden) | 0 | — |
| Emirates Telecommunications Corporation | 0 | — |
| British Telecom plc | 0 | — |
| ZTE Corp | 0 | -100% |
| Huawei Technologies Co., Ltd. | 0 | -100% |
| KHALIFA UNIV OF SCI & TECH & RES KUSTAR | 0 | — |
| Cisco Technology Inc | 0 | -100% |
| Analog Devices Inc | 0 | — |
Where to take this
The dataset points to specific next checks rather than a general conclusion.
Check freedom-to-operate against the top-ten cluster
Because 73.4% of records sit with ten assignees, a freedom-to-operate review for any core PTP, holdover or timestamping claim should start with that group's filings before broader prior-art search.
Run an FTO check in EurekaTest the under-claimed branches for a first-filer position
Asymmetry compensation and cross-domain profile translation show comparatively thin filing density relative to the core H04J cluster, which may support a narrower, faster first claim.
Explore white space in EurekaRe-run the trend once 2025-2026 filings publish fully
The apparent plateau after 2022 is partly a publication-lag artefact; revisit the filing trend in twelve months to confirm whether activity has genuinely flattened.
Track filing trends in EurekaCommon questions on clock synchronization patents
The assignee ranking in this dataset covers 77 companies, and it is led by a single assignee holding 37 of the 297 records in scope. The top five assignees combined hold 45.1% of all records, and the top ten hold 73.4%, so ownership is concentrated rather than evenly spread. Telecom infrastructure vendors and chipmakers dominate the upper half of the ranking, with university-linked research groups appearing mainly through joint filings alongside regional carriers.
Filing activity rose from 3 records in 2017 to a peak of 39 in 2022, and has not exceeded that level in any year since. Several of the largest historical filers show zero filings in the most recent tracked year, some with a -100% year-over-year change. Because publication typically lags filing by around 18 months, the most recent one to two years in any trend chart will understate true activity, so a firm conclusion of decline is premature — but the plateau since 2022 is real.
Precision time protocol (PTP) claims generally cover the messaging and timestamp-exchange mechanisms used to align clocks across a network, while holdover claims cover how a device maintains acceptable timing accuracy when its reference signal is lost or degraded. Both terms appear in the search criteria for this dataset alongside asymmetry compensation and hardware timestamping requirements, and records frequently combine more than one of these concepts in a single filing. IPC subclass H03L (automatic frequency and phase control), covering 10.1% of the 297 records, is the closest classification proxy for pure holdover and oscillator-control claims.
H04J, the multiplex communication subclass, appears in 52.9% of the 297 records in this corpus, making it the single most common classification by a wide margin. H04L (digital information transmission) follows at 30.0% and H04W (wireless communication networks) at 24.2%. Because a single patent record can carry several IPC classes, these percentages add up to more than 100%, and they should be read as an indicator of claim density in each area rather than a strict partition of the dataset.
The classification data shows comparatively lower filing density in areas like pulse-technique circuits (H03K, 3.0% of records) and radar/positioning-adjacent timing (G01S, 2.7% of records) relative to the dominant H04J cluster. Sub-areas such as asymmetry compensation for optical holdover paths and cross-domain PTP profile translation also show thinner coverage than the core transport-synchronization claims. Any freedom-to-operate or first-filer strategy should still be verified against the leading assignees' portfolios before assuming a gap is genuinely open, since low classification density can also reflect narrow search terms rather than an uncontested technical area.
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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.