Mechanical Seal Condition Monitoring Patents: Who Leads 2026
- 44 families total. this is a narrow filing space, not a crowded one — a handful of well-placed claims can still carry weight.
- G01M testing carries 31 of the records. the claim activity sits on measurement and diagnostic method, not on the seal hardware itself (F16J, 18 records).
- Filing peaked at 5 in 2025 after a flat mid-decade. the 2022 midpoint of 3 shows no sustained growth curve — this is an intermittent filing pattern, not an emerging boom.
Filing growth compares 2021 (4 records) with 2024 (2) — 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 44 records in scope (CR5), not by the ranked leaders only.
A niche intersection of seal hardware and diagnostic instrumentation
Mechanical seal condition monitoring sits at the intersection of two much larger fields: rotating seal hardware and industrial test-and-measurement instrumentation. The dataset behind this page — 44 patent families published between 2015 and mid-2026 — is small by the standards of either parent field, which means individual filings carry more relative weight than in a crowded category. The claim activity concentrates in G01M (testing machine and structure balance, 31 records) rather than in the seal body itself, indicating that applicants are protecting the sensing and diagnostic method more often than the mechanical seal design.
Filing activity is intermittent rather than compounding: a flat middle of the decade followed by a peak of five families in 2025. Because publication typically lags filing by around eighteen months, the most recent year understates real activity — but even accounting for that lag, this is not a field with a clear growth trajectory yet.
Filing trend and technology composition
Two views of the same 44-family dataset: how filing activity has moved year over year, and which IPC subclasses carry the claim weight.
Filing activity is flat, not rising
Annual counts move from 0 in 2017 to a peak of 5 in 2025, with 2022 sitting at the midpoint value of 3. There is no multi-year upward run in the data — activity comes in short bursts rather than a sustained ramp, and the partial 2026 count should be read with the publication lag in mind rather than as a decline.
Testing and diagnostics outweigh seal hardware
G01M (testing machine and structure balance) accounts for 31 of the 44 records, more than the seal-hardware subclass F16J (18) and the pump subclasses F04D and F04B combined (10). Signalling systems (G08B), material analysis (G01N) and fire-fighting (A62C) each appear once or twice, marking the outer edge of where this technology gets applied rather than a second core.
Shares are the percentage of the 44 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Mechanical Seal Condition Monitoring with Eureka
This page is one run against one query. Ask Eureka your own question about mechanical seal condition monitoring and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art that shapes freedom to operate
US20240328887A1 — System and method to mechanical seal condition monitoring and early failure detection
Filed by Saudi Arabian Oil Company, the application describes a rotating-shaft seal assembly with a patch of sensors embedded directly in the gland plate to measure physical parameters of the contact seal — comprising a rotating and stationary seal face — during operation, feeding a controller for early failure detection.Filed 2024-10-03. Abstract condensed from the published application.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5072948A | Seal assembly for a high speed machining system | 43 |
| 2 | JP1992050744A | Method and device for leak inspection of mechanical seal | 21 |
| 3 | WO2012050432A2 | Mechanical seal static air test apparatus | 10 |
| 4 | JP1989242876A | Method for controlling pressure of mechanical seal and control device thereof | 10 |
| 5 | JP1991107673A | Mechanical seal leaked oil receiving chamber | 7 |
| 6 | US20180156219A1 | Shaft-sealing device and submersible pump | 6 |
| 7 | KR101681064B1 | Leak sensing device of fire pump and fire hose using electric of apartment house | 6 |
| 8 | JP1992219573A | Device for foreseeing abnormality in mechanical seal | 5 |
| 9 | JP1988061931A | Centralized control system for mechanical seal | 5 |
| 10 | JP1985245876A | Supply device of cooling water in multistage mechanical seal | 5 |
Citation counts favour older filings that have had more time to accumulate references within the searched corpus — treat them as a measure of influence on later filings, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three figures from this dataset matter more than the headline count: where the claim density sits, where the citations point, and how the jurisdiction mix reads.
Diagnostic method, not seal geometry, is the contested ground
Nearly three-quarters of the corpus sits in G01M testing classifications rather than F16J seal-body classifications. Applicants defending a new seal shape without a matching monitoring claim are filing into the thinner side of this dataset.
One 1990s filing still anchors the citation graph
US5072948A, covering a seal assembly for high-speed machining systems, carries far more citations than any other record in the set. Any freedom-to-operate review in this space should start there, even though the filing predates modern sensor-embedded approaches.
Filing is concentrated in China and Japan, thin elsewhere
China and Japan together account for the large majority of receiving-office filings, with the United States, PCT, Canada and the EPO each in single digits. A filer targeting US or European enforcement is working against a much smaller local prior-art base.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to mechanical seal condition monitoring, with the prior art for and against each one.
A fragmented assignee base with no dominant filer
Recent-year momentum across the leading assignees in this dataset shows no filer active in the latest year — a pattern consistent with a field that fills in bursts rather than through sustained programmes.
No assignee shows current-year activity
Every one of the leading assignees tracked in this dataset — including Eagle Industry, Hitachi and Jiangsu Nuclear Power — shows zero filings in the latest year. That is more likely a publication-lag artefact than a sign the field has gone quiet.
Filing is a China-Japan story with a thin Western tail
The combined China and Japan filings make up the bulk of the corpus, while the United States, PCT, Canada and Europe together contribute a small fraction. Competitive tracking should weight Chinese and Japanese publications first.
A field small enough for a single filing to matter
With only 44 families across more than a decade, no single assignee has built a dense filing wall. New entrants with a well-drafted sensor-integration claim can still establish meaningful position here.
| Assignee | Recent year | YoY |
|---|---|---|
| Eagle Industry Co., Ltd. | 0 | — |
| Hitachi, Ltd. | 0 | — |
| Jiangsu Nuclear Power Co., Ltd. | 0 | — |
| Ford Motor Company of Canada, Ltd. | 0 | — |
| Tokyo Gas Co., Ltd. | 0 | — |
| AZHAR BIN ZAINAL ABIDIN | 0 | — |
| Huangshan Youyi Nanhai New Materials Co., Ltd. | 0 | -100% |
| Han Guoyong | 0 | -100% |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, white-space filing or competitive tracking.
Run a freedom-to-operate check against the citation anchor
Start with US5072948A and the other most-cited records before drafting claims around seal-body geometry combined with sensing — that intersection has the deepest prior art in this set.
Explore prior art in EurekaDraft into the sensor-integration white space
Embedded gland-plate sensing and predictive maintenance algorithms show thin claim coverage relative to general G01M testing methods — a specific, narrow claim there has room to stand.
Map white space in EurekaTrack Chinese and Japanese filings directly
With 22 of 44 records filed via China and 11 via Japan, an English-only watch will miss most of the field's activity.
Set up assignee tracking in EurekaCommon questions about this patent landscape
This dataset identifies 44 patent families published between 2015 and mid-2026 that match mechanical seal, rotary seal or face seal terminology combined with condition-monitoring, leakage-detection or predictive-maintenance language, classified under F16J15/34, G01M3 or G01M13. That is a small corpus compared to broader seal-technology or industrial-sensor categories, reflecting how specific the intersection is. Because publication lags filing by roughly 18 months, the true count of filed-but-unpublished applications for the most recent years is likely somewhat higher than shown.
The assignee base is fragmented, with names including Eagle Industry, Hitachi, Jiangsu Nuclear Power and Ford Canada appearing among the leading filers, but none currently shows activity in the latest tracked year. No single company has built a dense filing wall in this space, which is unusual for a topic tied to industrial equipment reliability. That fragmentation means competitive position is still open to a well-drafted new entrant.
The core classifications are G01M (testing machinery and structure balance) and F16J (pistons, seals and gaskets), with G01M alone accounting for 31 of the 44 records in this dataset. Secondary classifications include F04D and F04B for pump applications, and smaller counts in G01N, G08B, A62C and B23Q where the monitoring technology touches material analysis, alarms, fire-fighting equipment or machine tooling. The weighting toward G01M shows that diagnostic method, not seal hardware, is where most claims are staked.
Not on a clear upward trend based on this dataset: filing activity moved from 0 in 2017 to a midpoint of 3 in 2022 and peaked at 5 in 2025, without a sustained multi-year climb. That pattern reads as intermittent filing rather than an emerging technology curve. The partial 2026 figure should not be read as a decline, since recent filings are still working through the roughly 18-month publication lag.
US20240328887A1, filed by Saudi Arabian Oil Company and published 2024-10-03, describes a rotating-shaft seal assembly with sensors embedded directly in the gland plate to measure physical parameters of the contact seal — which comprises a rotating seal face attached to the shaft and a stationary seal face mounted on the gland plate — feeding a controller for early failure detection. It is a representative example of the sensor-integration approach that sits within the broader G01M-heavy claim landscape in this dataset. Anyone drafting around embedded gland-plate sensing should review its specific claim scope directly.
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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.