Electromagnetic Flow Meters Patents: Who Leads, Trends 2026
- 56.6% concentration. The top 5 of 31 ranked assignees hold 81 of 143 records in scope – more than half the field sits with a handful of filers.
- Filing cooled after 2021. Filings peaked at 10 in 2021 and fell to 3 by 2024, a 70% drop over that span, before recent partial years understate the true rate.
- One class dominates. G01F flow-measurement claims cover 91.6% of the 143 records; every other class – wind turbines, combustion, nuclear – appears in single digits.
Filing growth compares 2021 (10 records) with 2024 (3) — 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 143 records in scope (CR5), not by the ranked leaders only.
What the electromagnetic flow meter patent record shows
Electromagnetic flow meters measure conductive fluid velocity by induced voltage across electrodes in a magnetic field, and the patent activity tracked here concentrates on the mechanical and signal-processing problems that keep that measurement reliable in the field: liner material choices that resist abrasion and chemical attack, electrode fouling countermeasures, behaviour near the conductivity limit of the fluid, empty pipe detection, grounding requirements for accurate zero-flow readings, and pulsed excitation schemes that reduce noise and drift. These are largely maintenance and accuracy problems, not new measurement principles.
The dataset covers 143 published records dated 2015 to the 2026-07-31 cut-off, ranked across 31 assignees. Most-cited records date from the 1980s and 1990s, which reflects citation accumulation over time inside a searched corpus rather than current filing intensity – a useful reminder that influence and recency are not the same signal.
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Filing trend and technology composition
Two views of the same 143 records: when the claims were filed, and which IPC subclasses they sit in. Both are read against the denominators stated below – never against each other.
Filing trend, 2017-2026
Filings rose to a peak of 10 in 2021, then fell to 3 by 2024 – a 70% decline over that three-year span. 2025 and 2026 figures are still partial: publication typically lags filing by around 18 months, so the most recent two years will fill in as more records publish, and should not be read as a continuing slide.
Technology composition by IPC subclass
G01F (flow, level and volume measuring) appears in 91.6% of the 143 records, confirming this dataset is squarely a flow-measurement corpus. Adjacent classes – F03D wind motors, F23C combustion apparatus, G21C nuclear reactors, E21B wells – each appear in roughly 3-6% of records, marking where electromagnetic flow sensing is claimed as a component inside a larger system rather than as the primary invention. Since a record can carry several classes, these shares are read against the 143-record total, not against each other.
Shares are the percentage of the 143 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Electromagnetic Flow Meters with Eureka
This page is one run against one query. Ask Eureka your own question about electromagnetic flow meters and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this field
Full bore magnetic flowmeter assembly with temperature sensing element
A magnetic flowmeter assembly with electrodes disposed about a tubular body, where at least one electrode includes an embedded temperature sensing element well heatsinked to the electrode surface in contact with the fluid. This lets a single assembly measure flow rate and fluid temperature simultaneously, avoiding a separate temperature port.Filed by Georg Fischer Signet LLC, published 2020-08-13 as US20200256714A1.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4388834A | Electromagnetic flowmeter having a monolithic conduit | 110 |
| 2 | US5773723A | Flow tube liner | 103 |
| 3 | US4631969A | Capacitance-type electrode assemblies for electromagnetic flowmeter | 79 |
| 4 | US6014902A | Magnetic flowmeter with diagnostics | 67 |
| 5 | US4513624A | Capacitively-coupled magnetic flowmeter | 64 |
| 6 | US4403933A | Apparatus for injection-molding a liner onto a metal spool | 57 |
| 7 | US3750468A | Lined flow tube for electromagnetic flowmeter | 49 |
| 8 | US5426984A | Magnetic flowmeter with empty pipe detector | 45 |
| 9 | US4297897A | Field replaceable electrode assembly for magnetic flowmeter | 44 |
| 10 | WO2021159117A1 | Magnetohydrodynamic hydrogen electrical power generator | 38 |
Ranked by citation count within the searched corpus. High citation counts favour older records that have had more time to accumulate them – a signal of influence, not of current filing activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once the ranking, trend and class data are read together.
Core claim space is occupied by a small group
The leader holds 25 records and the top 5 combined hold 81 of the 143 records in scope. That is a field where electrode, liner and excitation claims from a handful of long-standing instrumentation makers already cover much of the obvious ground.
Filing volume has cooled from its 2021 peak
The 70% drop from 10 filings in 2021 to 3 in 2024 suggests the wave of pulsed-excitation and diagnostic-electrode filings that built through the late 2010s has largely played out for the current assignee set. Recent partial years are not yet comparable given publication lag.
Almost everything sits in one IPC subclass
Adjacent classes such as F03D, F23C, G21C and E21B each cover single-digit shares of records, meaning electromagnetic flow sensing shows up as a component claim inside wind, combustion, nuclear and well applications far less often than as a standalone measurement invention.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electromagnetic flow meters, with the prior art for and against each one.
Who holds the claims, and where the gaps sit
The ranked leaders are long-established flow-instrumentation makers; the co-filing pattern and recent-year momentum both point to a mature, low-churn competitive set rather than new entrants.
A single leader well ahead of fifth place
The leading assignee holds 25 of 143 records, more than double the fifth-place holder's 10. That gap indicates a sustained, multi-decade filing programme rather than a single product cycle.
A long tail below the top 10
The top 10 of 31 ranked assignees account for 79.0% of all 143 records, leaving a long tail of smaller filers – equipment makers and component suppliers – each holding only a handful of records.
Co-filing is limited and inventor-linked
Only 9 co-assignee pairs appear across the dataset, the strongest tied to a single inventor-assignee combination filing 4 times together. This points to internal R&D teams rather than joint-venture or cross-licensing filing patterns.
| Assignee | Recent year | YoY |
|---|---|---|
| Brilliant Light Power, Inc. | 1 | — |
| Rosemount Inc. | 0 | — |
| The Foxboro Company | 0 | — |
| FISCHER & PORTER CO | 0 | — |
| Micro Motion, Inc. | 0 | — |
| THOMPSON EQUIP | 0 | -100% |
| Toshiba Corporation | 0 | — |
| Emerson Electric Co. | 0 | — |
Where to take this analysis
The dataset points to a mature core and a thinner set of adjacent branches. Two directions are worth pursuing depending on whether the goal is defence or expansion.
Map the electrode and liner claim boundaries
With 56.6% of records held by five assignees, a freedom-to-operate review of electrode fouling and liner material claims is the highest-value first step before committing to a design in this space.
Explore claim scope in EurekaTrack the adjacent-class branches
F03D, F23C, G21C and E21B each show single-digit record shares – worth monitoring for early movement as electromagnetic flow sensing gets pulled into wind, combustion, nuclear and well-monitoring systems.
Set up class monitoring in EurekaCommon questions about electromagnetic flow meter patents
The dataset ranks 31 assignees, with the leading company holding 25 of the 143 records in scope – more than double the fifth-place holder's 10. The top 5 assignees together hold 81 records, or 56.6% of all records in scope, meaning over half the documented claim space sits with a small number of long-established flow-instrumentation manufacturers. Below the top 10, which together hold 79.0% of records, the field thins into a long tail of single- or few-filing entrants.
Filings peaked at 10 in 2021 and fell to 3 by 2024, a 70% decline over that three-year span, which points to a cooling rather than a growing field for the current assignee set. That said, publication typically lags filing by around 18 months, so 2025 and 2026 figures in any dataset are necessarily incomplete and should not be read as continued decline. The safest reading is that the field peaked around 2021 and has since returned to a lower, steadier filing rate.
The search scope centres on reliability and accuracy issues rather than the core measurement principle: liner material selection, electrode fouling, behaviour near the fluid's conductivity limit, empty pipe detection, grounding requirements, and pulsed excitation schemes. Almost all records – 91.6% of the 143 in scope – sit under IPC class G01F, the flow, level and volume measuring class, confirming this is a mature measurement field where the remaining innovation is in engineering robustness rather than a new sensing approach.
The thinnest coverage relative to the core G01F cluster shows up in adjacent application classes – wind turbines (F03D), combustion apparatus (F23C), nuclear reactors (G21C) and well drilling (E21B) – each appearing in only 3.5% to 6.3% of the 143 records. Within the core measurement claims, empty-pipe detection in non-standard pipe orientations and low-conductivity pulsed excitation schemes also show thinner documented coverage than electrode and liner material claims. These are reasonable areas to probe for a first-filing position rather than a design-around.
The most-cited record in this dataset is US4388834A, an electromagnetic flowmeter with a monolithic conduit, cited 110 times, followed by US5773723A on flow tube liners at 103 citations and US4631969A on capacitance-type electrode assemblies at 79 citations. These are all older filings from the 1980s and 1990s, and their high citation counts reflect decades of accumulated citations within the searched corpus rather than current relevance – any freedom-to-operate check should still treat them as foundational prior art for liner and electrode claims.
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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.