Photoacoustic Gas Detection Patents: Leaders & Trends 2026
A data-backed look at photoacoustic gas detection patents: who holds the ranked leaders' share of 918 records, where filings are concentrated by IPC class, and where white space remains for new entrants.
Filing growth = 2021 (43 records) → 2024 (20); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 918 records in scope (CR5), not the ranked leaders only.
What the photoacoustic gas detection patent record shows
Photoacoustic gas detection turns absorbed light into an acoustic signal inside a sensing cell, and the 918 records captured here span industrial safety monitors, downhole hydrocarbon analysis, and medical diagnostic devices built on the same core physics. Filing activity is broad rather than narrow: a record can carry several IPC classes, and material analysis and testing (G01N) shows up in 81.4% of records, far ahead of any secondary class. The leader in the assignee ranking holds 122 records, well clear of the field, but the ranking runs 100 companies deep before it thins into single-filing entrants.
Publication lags filing by roughly 18 months, so the most recent one or two years in any trend understate real activity. The peak year on record, 2019, and the -53% move from 2021 to 2024 are both drawn from years far enough back to be treated as settled.
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Filing trend, technology mix and concentration
Three views of the same 918-record dataset: how filing volume moved year over year, which IPC subclasses carry the claim density, and how much of the field the ranked leaders control.
Filing trend: rise, peak, retreat
Annual filings rose from 20 in 2017 to a peak of 98 in 2019, then declined; the 2021-to-2024 window alone shows a -53% drop, from 43 records to 20. Treat 2025 and 2026 figures as provisional given the publication lag.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Where the claims sit
G01N (material analysis and testing) covers 81.4% of the 918 records, with G01J (radiation and light measurement, 6.5%) and A61B (diagnosis and surgery, 6.0%) as the next-largest classes. E21B (wells, 3.2%) and B81B (MEMS, 2.4%) mark the smaller, more specialised branches.
Shares are the percentage of the 918 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe records that anchor this field
US20190145935A1 — Photoacoustic gas detection
A downhole system built around a quartz enhanced photoacoustic spectrometer (QEPAS) positioned within a wellbore, paired with a sampling system and a computer system that spectroscopically scans a wellbore fluid sample to determine hydrocarbon quantities in a subterranean hydrocarbon formation.Filed by Saudi Arabian Oil Company, published 2019-05-16 — an example of photoacoustic sensing applied to downhole hydrocarbon analysis rather than ambient air monitoring.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6035701A | Method and system to locate leaks in subsurface containment structures using tracer gases | 261 |
| 2 | US20080082078A1 | Glaucoma surgery methods and systems | 215 |
| 3 | US4492862A | Method and apparatus for analyzing components of hydrocarbon gases recovered from oil, natural gas and coal d… | 125 |
| 4 | US4740086A | Apparatus for the photoacoustic detection of gases | 116 |
| 5 | US20150101395A1 | Photoacoustic gas sensor device and a method for analyzing gas | 109 |
| 6 | US4543486A | Method and apparatus for using a photoacoustic effect for controlling various processes utilizing laser and i… | 108 |
| 7 | US20110320147A1 | Precision measurements in a fiber optic distributed sensor system | 107 |
| 8 | US4557603A | Detection means for the selective detection of gases, based on optical spectroscopy | 106 |
| 9 | WO2003074005A2 | KDR and VEGF/KDR binding peptides and their use in diagnosis and therapy | 105 |
| 10 | US20060123884A1 | System and method for gas analysis using doubly resonant photoacoustic spectroscopy | 103 |
Citation counts favour older filings that have had more time to accumulate references — read them as a signal of influence within this searched corpus, not as a ranking of current technical importance.
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The ranking and the class breakdown point to a field with a strong core cluster in industrial gas sensing, thinner but active branches in medical and drilling applications, and room for new claims where MEMS miniaturisation meets photoacoustic cells.
A cluster of leaders, not a monopoly
The top 5 assignees combine for 35.0% of all 918 records and the top 10 for 45.1%. That leaves more than half the field to the remaining 90 ranked companies and to unranked single-filing entrants — a workable landscape for a new entrant with a differentiated cell design.
Past-peak, not abandoned
Annual filings fell from 43 in 2021 to 20 in 2024 after peaking at 98 in 2019. That is a real pullback in claim activity over a clean three-year window, though it says nothing about 2025–2026 filings still working through publication.
Claim density sits in material analysis
G01N (material analysis and testing) appears in 81.4% of the 918 records, dwarfing every other class. The smaller classes — B81B (MEMS, 2.4%), C12Q (enzyme/DNA testing, 2.5%), A61K (medicinal preparations, 2.6%) — mark where photoacoustic sensing is being adapted into new device forms rather than repeating the core cell architecture.
Joint filing is rare and concentrated
Only 10 co-assignee pairs appear across the dataset, and the strongest pairing files jointly just 6 times. Most organisations in this field file independently rather than through joint ventures or shared R&D filings.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to chemical & gas sensors: photoacoustic gas detection patent landscape, with the prior art for and against each one.
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, sourcing partners, or spotting an open filing position.
Map the white space in MEMS integration
B81B (MEMS) sits at just 2.4% of records against G01N's 81.4%. Miniaturised photoacoustic cells suitable for wearable or handheld formats look under-claimed relative to bulk industrial sensor designs.
Explore white space in EurekaWatch the leader's downstream filings
The top-ranked assignee holds 122 records, well ahead of fifth place at 27. Tracking its most recent filings shows where the dominant player is extending claims before competitors can stake ground.
Track assignee activity in EurekaCheck freedom-to-operate against the most-cited records
The five most-cited records span leak detection, surgical systems and hydrocarbon analysis — a wide net for any new photoacoustic sensor design to clear before filing.
Run a clearance search in EurekaCommon questions on photoacoustic gas detection patents
The assignee ranking for this dataset covers 100 companies, and the top 5 combined account for 35.0% of all 918 records in scope, with the top 10 reaching 45.1%. The leader holds 122 records outright, well ahead of the fifth-ranked company at 27 and the tenth at 16. That gap between the leader and the rest of the top 10 suggests one organisation has built a durable filing lead, but the remaining 55% of the field is spread across a long tail of companies, so the space is not closed to new entrants.
Filings peaked at 98 records in 2019 and had fallen to 20 by 2024, a drop of 53% from the 43 records filed in 2021. That is a genuine three-year pullback measured on complete filing years. Figures for 2025 and 2026 are still incomplete because patent publication typically lags actual filing by around 18 months, so it would be premature to call the technology abandoned based on the most recent years alone.
The dominant class is G01N, material analysis and testing, present in 81.4% of the 918 records — reflecting that most photoacoustic sensor patents are framed as analytical instruments. Secondary classes include G01J (radiation and light measurement, 6.5%) and A61B (diagnosis and surgery, 6.0%), showing meaningful medical-device activity. Smaller classes such as E21B (wells, 3.2%) and B81B (MEMS, 2.4%) mark specialised applications in drilling and miniaturised sensor design respectively.
US20190145935A1, filed by Saudi Arabian Oil Company and published 2019-05-16, describes a downhole system using a quartz enhanced photoacoustic spectrometer (QEPAS) to analyse wellbore fluid samples for hydrocarbon content directly within a subterranean formation. It matters as a representative example of photoacoustic sensing extended well beyond ambient air monitoring into oilfield analytics. Anyone designing a downhole or harsh-environment photoacoustic sensor should review its claim scope for overlap before filing.
The clearest gap sits between the dominant G01N material-analysis filings (81.4% of records) and the much thinner MEMS class B81B (2.4%), suggesting miniaturised, chip-integrated photoacoustic cells are comparatively under-claimed relative to bulk sensor architectures. Co-assignee filing is also rare, with only 10 co-assignee pairs across the dataset, meaning most organisations file solo rather than through joint development. A new entrant focused on integrating photoacoustic cells into compact MEMS packages, or on joint filings with an established sensor maker, would be working in less crowded claim territory.
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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.