Industrial Pressure Transmitters Patents: Top Companies & Trends 2026
- 51.6% concentration. The five leading assignees together hold 346 of the 670 records in scope — over half the field sits with a small group of incumbents.
- Filing has cooled, not collapsed. Annual filings ran 21 in 2021 down to 14 in 2024, a 33% drop over that span, even as the underlying installed base of transmitters keeps growing.
- Force and pressure measurement dominates the classification. G01L covers 60.1% of all 670 records, meaning most competitive activity is concentrated in one IPC subclass rather than spread evenly.
Filing growth compares 2021 (21 records) with 2024 (14) — 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 670 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Industrial pressure transmitters convert a physical pressure differential into an electrical signal that a process control system can use, and the patent activity around them clusters tightly around a handful of recurring engineering problems: static pressure effect, long-term drift, diaphragm seal design, overpressure protection, turndown ratio, and hazardous area approval. This scope pulls 670 published records filed or published between 2015 and mid-2026 that reference at least one of these mechanisms alongside core transmitter terminology.
The records span multiple receiving offices, with the United States, the European Patent Office and Japan each carrying a large share, and WIPO PCT filings indicating multi-jurisdiction strategies among the larger assignees. Because a single invention can generate several family members across offices, the assignee ranking below is built on patent families rather than raw document counts, giving a fairer read of who actually controls the claim space.
Filing trends and technology composition
Two views of the same 670 records: how filing volume has moved year over year, and how the technology splits across IPC subclasses. Because publication lags filing by roughly 18 months, the final one or two years in the trend understate real activity.
Filing trend, 2017–2026
Filings peaked at 53 in 2018 and have since eased; the most recent complete comparison — 21 in 2021 against 14 in 2024, a 33% decline — points to a maturing rather than an expanding filing curve. 2025 and 2026 figures are still filling in and should not be read as a further drop.
IPC subclass composition
G01L (force and pressure measurement) accounts for 60.1% of the 670 records, far ahead of G01F flow/level measurement at 9.7% and E21B well drilling applications at 7.8%. Smaller shares in F16J seals, F17C pressure vessels, G06F digital processing and G01N material testing mark adjacent branches with lighter claim density.
Shares are the percentage of the 670 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Industrial Pressure Transmitters with Eureka
This page is one run against one query. Ask Eureka your own question about industrial pressure transmitters and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art anchoring this field
US4342231A — Differential pressure transmitter (Hitachi, 1982)
A differential pressure transmitter built from a separately jointed pressure-receiving portion and sensor portion. The sensor portion carries a semiconductor sensor with a resistance pattern on one face and thick-walled peripheral and central regions on the other, supported at its thick-walled periphery. The pressure-receiving portion uses seal diaphragms on both sides plus a central diaphragm, isolating the semiconductor sensor from direct process contact while still transmitting the differential signal.Filed decades before the current wave of activity, this record shows the diaphragm-isolation approach that much of the later G01L filing still builds on or designs around.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4734873A | Method of digital process variable transmitter calibration and a process variable transmitter system utilizin… | 179 |
| 2 | US20040163731A1 | Self-contained mobile fueling station | 117 |
| 3 | US6068053A | Fluid separation and reinjection systems | 114 |
| 4 | US4745810A | Flangeless transmitter coupling to a flange adapter union | 109 |
| 5 | US5731522A | Transmitter with isolation assembly for pressure sensor | 108 |
| 6 | US5710370A | Method for calibrating a differential pressure fluid flow measuring system | 93 |
| 7 | US5495768A | Pressure isolator assembly for sanitary processing | 76 |
| 8 | EP1452794A2 | Self-contained mobile fueling station | 75 |
| 9 | US7178565B2 | Self-contained mobile fueling station | 72 |
| 10 | US5022270A | Extended measurement capability transmitter having shared overpressure protection means | 69 |
Citation counts inside this searched corpus favour older filings and are a signal of influence on later designs, not 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 mean for a filing decision
Three readings of the dataset that matter more than the raw counts: where the field is concentrated, where it has slowed, and where the classification data says the open ground is.
Half the field sits with five assignees
346 of the 670 records in scope belong to the five leading assignees, and the top 10 combined reach 60.9%. New entrants filing directly against core diaphragm-seal or overpressure-protection claims are filing into occupied ground.
Growth has cooled at the top
Annual filings fell from 21 in 2021 to 14 in 2024. Recent-year momentum data shows several of the largest historical filers recording zero filings in the latest year, consistent with a field where core mechanisms are well claimed rather than one in retreat.
Pressure measurement crowds out adjacent branches
G01L absorbs the majority of filing activity, while F17C pressure vessels (3.3%), G06F digital processing (2.8%) and G01N material testing (2.7%) each carry a small fraction of the volume — these lighter classes are worth watching for openings.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to industrial pressure transmitters, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked leaders — the full 100-company set the dataset returns — is dominated by long-established instrumentation and process-control manufacturers, with a long tail of single- or few-filing entrants behind them.
A single assignee well ahead of the field
The top-ranked assignee holds 218 records, more than four times the fifth-place figure of 28, indicating a long-running, deliberate filing programme rather than opportunistic patenting.
A sharp drop-off after the top five
Fifth place holds 28 records and tenth place holds 11 — the gap between the leading cluster and the rest of the ranked field is steep, meaning influence concentrates fast outside the top five.
Historical leaders have gone quiet in the latest year
Several of the largest historical filers show zero filings in the most recent year, and the current leader's own latest-year count is down 67% year over year — a pause that may reflect either a maturing core claim set or reporting lag rather than retreat from the space.
| Assignee | Recent year | YoY |
|---|---|---|
| Rosemount Inc. | 1 | -67% |
| Endress+Hauser GmbH & Co. KG | 0 | — |
| Honeywell International Inc. | 0 | — |
| Toshiba Corporation | 0 | — |
| Yokogawa Electric Corporation | 0 | — |
| Control Pressure Operations Pte Ltd | 0 | — |
| Azbil Corporation | 0 | — |
| TotalEnergies OneTech Belgium | 0 | — |
Where to take this analysis
The dataset points to a field with a stable core and a cooling filing curve. The next steps depend on whether the goal is defensive clearance, acquisition targeting, or new filing strategy.
Map claims against the G01L core
With 60.1% of records classed under force and pressure measurement, any new filing in diaphragm seal or overpressure protection design needs a claim chart against the leading assignees' portfolios before drafting begins.
Run a claim comparison in Eureka →Track the lighter IPC branches
F17C, G06F and G01N classes each carry under 4% of records — thin enough that a well-drafted claim in drift-compensation processing or vessel-integrated mounting may still clear.
Explore white space in Eureka →Watch the momentum shift
Zero latest-year filings from several historical leaders is worth monitoring for the next reporting cycle, since publication lag can mask genuine renewed activity for another 12-18 months.
Set up monitoring in Eureka →Common questions on this landscape
The dataset's leading assignee holds 218 of the 670 records in scope, well ahead of the fifth-ranked assignee at 28 and the tenth-ranked at 11. The top five assignees combined account for 51.6% of all 670 records, so the field is concentrated at the top with a long tail of smaller filers behind it. Any freedom-to-operate review in this space should start with that leading cluster rather than the tail.
Filings peaked at 53 in 2018 and have since eased; the most recent complete year-over-year comparison shows 21 filings in 2021 falling to 14 in 2024, a 33% decline. Because publication lags filing by roughly 18 months, 2025 and 2026 figures in any trend chart are still incomplete and should not be read as confirming a further drop. The honest read is a maturing filing curve, not a collapsing one.
US4342231A, assigned to Hitachi and dated 1982, claims a differential pressure transmitter built from a separately jointed pressure-receiving portion and sensor portion, with a semiconductor sensor isolated from process contact by seal diaphragms on both sides plus a central diaphragm. It is one of the older, foundational records in this space and sits well outside its original enforcement window, but its diaphragm-isolation architecture is echoed in much later filing. Anyone designing a new diaphragm-seal transmitter should still review it for structural similarity even though it can no longer be asserted.
Based on IPC composition across the 670 records, classes like F17C pressure vessels (3.3%), G06F digital processing (2.8%) and G01N material analysis (2.7%) carry far lighter claim density than the dominant G01L force and pressure measurement class at 60.1%. These lighter branches — drift-compensation algorithms, vessel-integrated mounting, diaphragm material testing — are where a well-drafted first claim has a better chance of clearing prior art. That said, low density does not mean no relevant art, so a targeted search of each branch is still necessary before drafting.
Among receiving offices in this dataset, the United States leads with 144 records, followed by the European Patent Office at 122 and Japan at 99. WIPO PCT filings total 61, indicating that some assignees are pursuing multi-jurisdiction protection rather than filing nationally in each market. China follows at 47, a smaller but non-trivial share worth watching given the broader industrial sensor market's growth there.
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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.