Gas Sensor Signal Conditioning Patents: Leaders & Filing Trends 2026
A data-led look at gas sensor signal conditioning patents: 1,436 records since 2015, filing concentration, IPC composition, top receiving offices and where claim space remains open.
Filing growth = 2021 (40 records) → 2024 (32); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 1,436 records in scope (CR5), not the ranked leaders only.
What this patent landscape covers
This landscape covers 1,436 published records filed between 2015 and the 2026-08-31 data cut-off, matched against gas sensor readout, amplification and compensation circuitry claims under IPC classes G01, G01D and H03F. The scope spans analog front-end designs, transimpedance and potentiostat circuits, and compensation or filter stages built around gas sensing outputs — not gas sensors’ underlying chemistry alone.
Filing activity peaked in 2017 and has since eased, while the filing base remains heavily concentrated in China relative to other receiving offices. The assignee field shows one leader ahead of a long tail of smaller filers, and the technology composition skews strongly toward material-analysis circuitry filed together with the sensing method it supports.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trends and technology composition
The dataset spans 1,436 published records filed between 2015 and the 2026-08-31 cut-off, drawn from receiving offices led by China, the United States, Japan and Europe.
Filing activity, 2017-2026
Filings peaked at 90 in 2017 and stood at 32 in 2024, the most recent year that can be read as complete; that is a 20% decline across the 2021-2024 span (40 to 32). Counts for 2025 and 2026 are shown but understated, since publication typically lags filing by around 18 months.
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.
Technology composition by IPC subclass
G01N (material analysis and testing) carries 81.3% of the 1,436 records, confirming that most signal-conditioning claims are drafted around the sensing chemistry itself rather than as standalone amplifier or filter circuitry. Alarm signalling (G08B, 7.0%), general measuring (G01D, 6.7%) and flow measurement (G01F, 6.3%) form a secondary tier; control and regulation (G05B) and force/pressure measurement (G01L) sit lowest at 2.7% and 2.8% respectively, marking them as the thinnest-claimed adjacent branches. Because a record can carry more than one class, these shares add up to more than 100% of the 1,436-record total.
Shares are the percentage of the 1,436 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Gas Sensor Signal Conditioning Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about gas sensor signal conditioning patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
CN117462109A — Breath gas concentration detection device
Filed by Tianjin University of Technology on 2024-01-30, this record claims a breath gas concentration detection device centred on a constant-current source circuit built from two operational amplifiers. The first amplifier's negative input connects to two matched resistor pairs while its output feeds a second amplifier stage routed through an impedance-matching network to the gas concentration sensor itself; a computation module then derives the concentration of a single gas species from the resulting detection voltage.Abstract condensed from the original filing; resistor-matching conditions (R3=R4, R5=R6) define the claimed topology.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US11051876B2 | Surgical evacuation flow paths | 307 |
| 2 | US6469303B1 | Non-dispersive infrared gas sensor | 226 |
| 3 | US6428684B1 | Method and apparatus for diagnosing the condition of a gas sensor | 166 |
| 4 | CN101769889A | 一种农产品品质检测的电子鼻系统 | 125 |
| 5 | US20030079999A1 | Hydrogen gas sensor | 72 |
| 6 | US20080197022A1 | Gas sensor control apparatus designed to ensure accuracy of measurement in gas sensor | 65 |
| 7 | US5184500A | Gas detector | 62 |
| 8 | US20060173637A1 | Method of compensating for a measuring error and an electronic arrangement to this end | 61 |
| 9 | JP2004279293A | Self-diagnosis method for proton conductor gas sensor, and gas detector | 59 |
| 10 | US20180010943A1 | Ultrasonic gas flow meter based on FPGA and DSP | 58 |
Citation counts favour older filings simply because they have had longer to accumulate them; read them as a signal of influence on later drafting, not as a ranking of current commercial importance.
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.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the filing data signals
Four figures from this dataset matter more than the rest for anyone deciding where to file, watch or design around existing claims.
A leader, not a lock
The leading assignee holds 34 records on its own, but the top 5 filers combined only reach 8.1% of the 1,436 records in scope, and the top 10 reach 12.7%. That is a real lead without control of the field.
Circuitry claimed with chemistry
Most signal-conditioning claims are filed inside G01N material-analysis records rather than as standalone amplifier or filter patents, meaning conditioning IP is rarely separable from the sensing method it serves.
Past the 2017 peak
Filings peaked at 90 in 2017 and have declined since, down 20% from 2021 to 2024. Treat 2025-2026 counts as provisional given roughly 18 months of publication lag.
China-centred filing base
China's receiving office alone accounts for 706 of the 1,436 records, ahead of the United States (189), Japan (132) and the EPO (122) combined for second place.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to gas sensor signal conditioning patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Institut National d'Optique | VIENS JEAN FRANCOIS | 2 |
| Institut National d'Optique | LE NOC LOIC | 2 |
| Denso Corporation | Japan Automobile Research Institute | 1 |
| Figaro Engineering Inc. | KATO YUKI | 1 |
| Figaro Engineering Inc. | INOUE TOMOHIRO | 1 |
| Figaro Engineering Inc. | FUJIMORI YUKI | 1 |
| Institut National d'Optique | TREMBLAY BRUNO | 1 |
| Honeywell International Inc. | THORSON WALTER R | 1 |
Only 8 co-assignee pairs appear across the full 1,436-record dataset, so most filings — including from the largest assignees — are single-entity efforts rather than joint ventures.
Where to take this next
The dataset points to specific follow-up questions rather than a single conclusion; these are the ones worth running before committing a filing or freedom-to-operate budget.
Check the leader's actual claim scope
An 8.1% top-5 share means no single filer controls this field, but the leader's 34 records still need reading claim-by-claim before assuming open ground nearby.
Review leader filings in EurekaTest the thin branches for real white space
G01L and G05B sit lowest in the technology mix at 2.7-2.8% of records; that low density is worth confirming against the strongest cited art before drafting into it.
Run a white-space check in EurekaTreat 2025-2026 counts as provisional
Publication lag of roughly 18 months means the most recent two years understate real filing activity; re-run the trend once later data settles.
Track filing trends in EurekaCommon questions on gas sensor signal conditioning patents
Across the 100 companies in the ranked assignee table, the leading filer holds 34 of the 1,436 records in scope. That lead is notable but not dominant: the top 5 filers combined account for only 8.1% of all 1,436 records, and the top 10 combined reach 12.7%. In practical terms, this is a field with one clear leader sitting above a long tail of companies with far fewer filings each, rather than a market controlled by a handful of players.
Filings peaked at 90 in 2017 and have since settled lower, with 2021 at 40 and 2024 at 32 — a 20% decline over that three-year span. Figures for 2025 and 2026 appear lower still, but that reflects publication lag of roughly 18 months rather than a genuine drop in activity, so those two most recent years should not be read as the trend's true trajectory yet. Anyone tracking this space should treat 2024 as the last year with a reasonably complete count.
G01N, material analysis and testing, dominates with 81.3% of the 1,436 records, reflecting that most conditioning circuitry is claimed together with the underlying gas-sensing method rather than separately. Signalling and alarm systems (G08B) and general measuring (G01D) follow at 7.0% and 6.7% respectively. Force and pressure measurement (G01L, 2.8%) and control/regulating systems (G05B, 2.7%) are the smallest classes tracked, marking them as comparatively open ground rather than heavily contested territory.
China is the largest receiving office by a wide margin at 706 filings, followed by the United States at 189, Japan at 132, and the European Patent Office at 122. WIPO's PCT route accounts for 49 filings and South Korea 48. This distribution means a freedom-to-operate review focused only on the US or Europe would miss the majority of filed art, which sits in Chinese-language filings.
CN117462109A, filed by Tianjin University of Technology on 2024-01-30, claims a breath gas concentration detection device using a constant-current source built from two matched-resistor operational amplifier stages feeding a gas concentration sensor. It blocks designs that reproduce this specific dual-op-amp, matched-resistor constant-current topology for extracting a single gas species' concentration over a wide low-voltage dynamic range. It does not block constant-current gas sensing generally or amplifier readouts built on a different resistor-matching or single-stage design, and its reach outside China depends on whether a corresponding foreign filing exists, which this dataset does not confirm.
No — the dataset records only 8 co-assignee pairs across all 1,436 filings, indicating that most applicants file alone rather than jointly. The strongest pairs identified involve a national optics institute filing jointly with named individual inventors, and one pair links two automotive-sector research affiliates. This low collaboration density suggests that joint-filing strategies remain an underused option in this field, for parties willing to test it.
Research Gas Sensor Signal Conditioning Patent Landscape in depth with Eureka
Go past this page: query the whole gas sensor signal conditioning patent landscape corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.