Industrial Fieldbus Patents: Who Leads, Where the Gaps Are 2026
- Filing activity has cooled sharply since its 2017 peak of 8 records, with the trend flat-to-declining through the middle of the coverage window rather than accelerating.
- China leads receiving offices with 9 filings, ahead of Europe (7) and the United States (6), suggesting the active filing geography has shifted east of where the earliest, most-cited art originated.
- No assignee shows growth in the latest tracked year, including the strongest co-filing pair in the dataset — a sign the field is in a lull rather than a race.
Filing growth compares 2021 (1 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 36 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families at the intersection of industrial fieldbus and industrial communication protocols — Modbus- and Profibus-adjacent systems — where claims also touch deterministic latency, network topology, gateway design, diagnostics or time synchronization. The IPC scope spans H04L12 (digital information transmission), G05B19 (control and regulating systems) and H04L67 (network application protocols), which keeps the set anchored to communications infrastructure rather than the control logic or sensors sitting behind it.
Coverage runs from 2015 through the 2026 data cut-off, with 36 published families forming the ranking base. Because publication typically lags filing by around 18 months, the most recent one or two years in any trend chart will always understate actual filing activity — read the tail as a floor, not a ceiling.
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Filing trends and technology composition
Two views of the same 36-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A 2017 peak followed by a flat-to-declining run
Filings hit 8 in 2017, the high point of the window, then fell back toward zero by the 2022 midpoint and have not recovered since. That pattern reads less like a maturing field settling into steady output and more like a wave of early activity that has not been followed by a second wave — worth checking against adjacent categories before concluding the whole space has gone quiet.
H04L and G05B carry the claim weight
H04L (digital information transmission) appears in 28 of the 36 records and G05B (control and regulating systems) in 20, confirming this is fundamentally a networking-and-control hybrid category. G06F, H04W and H04B trail well behind, showing that wireless and general transmission framing is present but secondary to the core wired-protocol and control-system claims.
Shares are the percentage of the 36 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Industrial Fieldbus and Communication Protocols with Eureka
This page is one run against one query. Ask Eureka your own question about industrial fieldbus and communication protocols and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
Publishing data across a data diode for secured process control communications
To secure communications from a process plant across a unidirectional data diode to a remote system, a sending device at the plant end publishes data across the diode to a receiving device at the remote end. The publication of various data is respectively in accordance with context information — identification of data sources, expected rate of data generation or arrival, and similar — that is descriptive of data sources of the plant and recurrently provided by the sending device across the diode. A recurrence interval may be based on a tolerance for lost data or another characteristic of an application, service, or consumer of data at the remote end.Filed by Fisher-Rosemount Systems, Inc., published 2022-05-25.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2002005107A1 | Industrial automation networking system | 45 |
| 2 | US20190103914A1 | Methods and apparatus to bridge communications between devices using low-energy devices | 30 |
| 3 | GB2558055A | Publishing data across a data diode for secured process control communications | 23 |
| 4 | EP1307823A1 | Industrial automation networking system | 18 |
| 5 | CN114326634A | 基于异构工业数据采集协议的通用模型抽象系统及方法 | 14 |
| 6 | EP1307823B1 | Industrial automation networking system | 8 |
| 7 | KR101426050B1 | Programmable fieldbus internet gateway system | 6 |
| 8 | CN202759477U | 工业通讯协议转换系统 | 5 |
| 9 | DE60032263T2 | VERNETZUNGSSYSTEM FÜR DIE INDUSTRIELLE AUTOMATSIEURUNG | 5 |
| 10 | US20210083764A1 | Methods and apparatus to bridge communications between devices using low-energy devices | 4 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are a signal of what the field has built on, not of which claims are strongest today.
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 data means for a filing decision
Three read-throughs from the trend, geography and citation data that matter more for strategy than the raw counts alone.
Activity has not sustained past its early peak
The 2017 high of 8 filings was not followed by a comparable wave; by the 2022 midpoint volume had dropped to zero and stayed low. Treat any renewed interest here as a re-entry into a category with a thin recent prior-art base rather than a crowded one.
China now leads receiving-office volume
China's 9 filings edge out Europe's 7 and the United States' 6, with Canada and the UK each holding 3. The most-cited foundational records originated through WIPO, EPO and US filings, so the center of gravity for new filings has moved even as the earliest influential art sits elsewhere.
Influence is concentrated in a handful of early records
The most-cited filing carries 45 citations versus single digits for many others in the set, and several of the highest-cited records date to the early 2000s. That concentration is a citation-count artifact of age as much as merit — newer filings simply have not had time to accumulate references.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to industrial fieldbus and communication protocols, with the prior art for and against each one.
Who is filing, and how they cluster
36 families spread across a mix of individual inventors, controls specialists and one identifiable co-filing pair — a structure closer to a long tail than a concentrated field.
Swales Andrew and LAN Controls file together
The strongest co-assignee relationship in the dataset pairs an individual inventor with LAN Controls across 5 shared families — the only pairing dense enough to call a pattern rather than a coincidence.
No assignee is currently accelerating
Every assignee tracked for recent-year momentum, including Fisher-Rosemount Systems and Scorpion Controls, shows zero filings in the latest year, and at least one Chinese robotics filer shows a full year-over-year drop. This is consistent with the broader flat-to-declining trend rather than an isolated gap.
A long tail with no dominant assignee
With 36 families spread across process-control incumbents, controls specialists and individual inventors, no single assignee holds a commanding share. That structure lowers the risk of running into one party's dense claim thicket, but it also means less precedent exists for any one claim strategy.
| Assignee | Recent year | YoY |
|---|---|---|
| Fisher Controls International LLC | 0 | — |
| SWALES ANDREW | 0 | — |
| LAN CONTROLS | 0 | — |
| Fisher-Rosemount Systems, Inc. | 0 | — |
| SCORPION CONTROLS | 0 | — |
| Chongqing HZ Robot Co., Ltd. | 0 | -100% |
| Xie Buming | 0 | — |
| Shenzhen Gumei Technology Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to a field with cooled overall volume but an active geographic shift and thin coverage in several bridging technologies.
Model the design-around space
Run the highest-cited claims — particularly around data-diode publication and industrial automation networking — through a claim-chart exercise before committing to a filing direction in the same sub-area.
Explore claim charts in EurekaTrack the China filing shift
With China now the leading receiving office, monitor new publications there specifically, since the 18-month publication lag means recent Chinese activity is likely understated in current counts.
Set up monitoring in EurekaTest the white-space branches
Deterministic-latency gateway scheduling and cross-protocol time-sync fallback show thin filing density relative to the core H04L/G05B claims — worth a freedom-to-operate check before assuming the space is open.
Run a white space search in EurekaCommon questions about this landscape
In this landscape, a record qualifies if its title or claims reference industrial fieldbus, industrial communication protocols, or named systems like Modbus or Profibus, combined with claim language on deterministic latency, network topology, gateway design, diagnostics or time synchronization. The IPC scope is further narrowed to H04L12, G05B19 and H04L67, which keeps the set focused on communications infrastructure rather than the sensors or control algorithms it carries. This is a deliberately bounded search, so adjacent categories like pure industrial Ethernet switching may sit just outside it.
The dataset shows filings reaching 8 in 2017 before dropping toward zero by the 2022 midpoint and staying low since. This could reflect the underlying technology settling into established standards where further patenting offered less incremental value, a shift of R&D investment toward adjacent wireless or Ethernet-based protocols, or simply a gap in this particular claim combination that a broader search would fill differently. Because publication lags filing by about 18 months, the most recent one to two years should be read cautiously rather than as confirmed decline.
Citation concentration in this corpus favors a small number of early records, including a foundational industrial automation networking filing with 45 citations and related filings from process-control specialists like Fisher-Rosemount Systems. High citation counts here reflect age and foundational status more than current commercial dominance, since older records have simply had more time to accumulate references. No single assignee in the broader 36-family set holds a commanding share of filings, so influence and volume are not concentrated in the same hands.
Yes — filing density is thin relative to the core H04L and G05B claim space in specific bridging areas, including deterministic-latency scheduling for hybrid wired-wireless gateways and time-synchronization fallback across heterogeneous fieldbus segments. These are technically specific gaps rather than broad unclaimed categories, so a workable first claim would need to combine an existing gateway or diagnostic mechanism with one of these under-served functions. A freedom-to-operate check against the most-cited foundational patents is still advisable before filing there.
Receiving-office data shows China now ahead with 9 filings, followed by Europe with 7 and the United States with 6, while Canada and the UK each hold 3. This is a shift from the geography of the earliest, most-cited foundational filings, which came through WIPO, EPO and US routes. Filing strategy should weigh this eastward shift in active filing against where enforcement and market exposure actually matter for a given product line.
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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.