Airtightness Leakage Detection Patents: Top Filers & Trends 2026
Filing growth compares 2021 (6 records) with 2024 (5) — 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 26 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent activity matching Airtightness Leakage Detection across 26 published records filed between 2015 and 2026. Every record in scope was filed through a Chinese receiving office, which frames this as a domestically-driven technology base rather than a globally contested one. The dataset spans testing rigs, valve inspection tooling, and adjacent handling and coating equipment used to verify seal integrity in components and assemblies.
Filings cluster around mechanical test apparatus rather than software-driven detection methods, and the assignee base is fragmented: a long tail of single- or double-filing entrants sits behind a small group of firms with two or three records each. That combination — occupied hardware claim space, thin leadership, and a narrow geographic footprint — shapes where a new entrant can realistically stake a claim.
Filing trend and technology composition
Two views of the same 26-record dataset: how filing activity has moved year over year, and which IPC subclasses carry the claims.
Filing trend, 2015-2026
Filing rose to a peak of 6 records in 2021, then eased to 5 by 2024 — a -17% change over that three-year span. Treat 2025 and 2026 as incomplete: publication typically lags filing by roughly 18 months, so recent-year counts will continue to rise as more records surface.
IPC subclass distribution
G01M (testing machines and structure balance) appears in 69.2% of the 26 records, far ahead of G01N material analysis and testing at 11.5%. Cleaning, hand-tool, valve and coating-related classes each cover a handful of records — a signal of adjacent equipment rather than a competing detection approach. Because records can carry more than one IPC class, these shares sum to more than 100%.
Shares are the percentage of the 26 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Building Envelope & Efficiency: Airtightness Leakage Detection Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about building envelope & efficiency: airtightness leakage detection patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaA representative record
Valve airtightness leakage detection apparatus
The utility model discloses a valve airtightness leakage detection apparatus comprising a detection device and a detection stand, with a clamping mechanism set inside the stand and a pulling mechanism set on the inner side of the clamping mechanism. The clamping mechanism holds the valve steady during testing, while the pulling mechanism drives the clamp, together addressing the problem of valve displacement during detection that causes measurement inaccuracy or physical damage to the valve.Filed by Feixian Continental Valve Co Ltd, 2024-12-27.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN103671969A | 一种双蝶板外清洗无菌式防混阀 | 10 |
| 2 | CN212807525U | 一种阀门气密性泄漏检测装置 | 6 |
| 3 | CN217059223U | 一种离合器的气密的泄漏检测装置 | 5 |
| 4 | CN112014037A | 一种累积法泄露检测方法和系统 | 5 |
| 5 | CN116878776A | 一种金属波纹管壳体气密性检漏设备 | 4 |
| 6 | CN114294571A | 一种车载供氢系统自动检漏控制系统及自动检漏控制方法 | 4 |
| 7 | CN111289190A | 铂铑合金搅拌器焊缝高温气密性检漏装置及其应用 | 3 |
| 8 | CN221123743U | 一种卧式容器气密性检漏观察工具 | 2 |
| 9 | CN115265956A | 一种压力系统气密检漏设备及方法 | 2 |
| 10 | CN118817199A | 一种差压式气密性检漏设备 | 1 |
Citation counts favour older records simply because they have had more time to accumulate citations within this corpus — read them as a signal of influence, not of current relevance.
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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Three signals worth acting on before drafting claims in this space.
No single gatekeeper controls this space
The leading assignee holds only 2 of the 26 records in scope, and the top 5 combined reach just 26.9% of all records. That is a fragmented field rather than one blocked by a dominant incumbent's claim estate.
Testing-apparatus claims are the crowded lane
G01M — testing machines and structure balance — appears in 69.2% of the 26 records, making mechanical test-rig claims the most contested part of this landscape. Detection methods classified elsewhere, such as G01N material analysis, carry a fraction of that density.
Activity has cooled from its 2021 peak
Filing rose to 6 records in 2021 before falling to 5 by 2024, a -17% change. Because publication lags filing by roughly 18 months, 2025-2026 counts are not yet a reliable read on whether that cooling continues.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to building envelope & efficiency: airtightness leakage detection patent landscape, with the prior art for and against each one.
Where to take this next
The landscape points to a fragmented, hardware-heavy field with room to move — but drafting a defensible claim means checking it against the specific prior art first.
Map a candidate claim against the crowded G01M cluster
Before drafting in testing-apparatus space, run the proposed claim against the existing G01M records to see how close the language sits to filed structures.
Explore claim comparisons in EurekaTrack the under-claimed branches as they fill in
Cleaning-integrated, valve-specific and coating-process leak detection each carry only a few records today; watch these for new entrants before committing to a filing strategy.
Set up monitoring in EurekaCommon questions on airtightness leakage detection patents
No single company dominates this field. The leading assignee in the ranking holds only 2 of the 26 published records in scope, and the top 5 assignees combined account for just 26.9% of all records. That level of fragmentation means a new entrant is unlikely to face a single blocking portfolio, though individual claims still need clearing against the specific records held by each filer.
G01M, covering testing machines and structure balance, appears in 69.2% of the 26 records in scope, making it the clear centre of gravity for this landscape. G01N material analysis and testing is a distant second at 11.5%. Classes such as cleaning, valves, hand tools and coating processes each cover only a handful of records, suggesting these are adjacent equipment uses rather than competing detection methods.
Filing peaked at 6 records in 2021 and had fallen to 5 by 2024, a -17% change over that three-year span. That is the most reliable read available, because publication typically lags filing by around 18 months, which means 2025 and 2026 counts are still incomplete and should not be read as evidence of a continuing decline or a rebound.
Every one of the 26 records in scope was filed through a Chinese receiving office. There is no evidence in this dataset of parallel filing activity in other jurisdictions, so this appears to be a domestically concentrated filing base rather than one contested across multiple patent offices.
The under-claimed branches sit outside the dominant testing-apparatus cluster: cleaning-integrated leak testing, fastener or hand-tool assisted seal verification, valve-specific detection tooling, and coating-process integrity checks each cover only two or fewer records. These branches carry enough prior art to establish the concept but not enough density to have crowded out a well-drafted first claim, particularly one that combines detection with an adjacent process step.
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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.