Electrochemical Impedance Spectroscopy Patents: Leaders & Trends 2026
- Filing has cooled since its 2021 peak. 50 families published that year against 36 in 2017 and just 7 so far in the most recent, still-incomplete year — publication lag means the last two years understate real activity.
- Material analysis dominates the IPC mix. G01N (material analysis & testing) appears in 429 of 508 families, more than double the next-largest subclass, G01R (electric & magnetic measurement) at 149.
- No single assignee is compounding filings. Every top-momentum assignee shows zero filings in the latest year, including one with a -100% year-on-year drop — ownership is fragmented rather than concentrated in an active leader.
Filing growth compares 2021 (50 records) with 2024 (33) — 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 508 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Electrochemical impedance spectroscopy (EIS) patents span a wider range of end uses than the technique’s lab-bench reputation suggests. This dataset pulls 508 patent families filed between 2015 and mid-2026 that combine EIS-related search terms with claim-level detail on equivalent circuit fitting, frequency sweep protocols, reference electrode design, overpotential analysis, or in-situ measurement. The IPC mix confirms that material and electrical testing, not battery diagnostics alone, is where most of the claim activity sits.
Filings route heavily through the United States, with Europe, the WIPO PCT track, India, China and Canada following at a considerable distance. That distribution points to a technology whose commercial value is being defended first in the US market, then extended selectively rather than filed globally as a matter of course.
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Filing trend and technology composition
Two views of the same 508-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
A 2021 peak followed by decline
Annual filings rose from 36 in 2017 to a peak of 50 in 2021, then fell — 2022's midpoint figure of 19 confirms the drop is not a single bad year. Because publication lags filing by roughly 18 months, the last one to two years will always look smaller than they eventually turn out to be, but the multi-year decline predates that effect.
Material testing leads, biomedical and battery uses trail
G01N (material analysis & testing) covers 429 of 508 families, well ahead of G01R electric/magnetic measurement (149) and A61B diagnosis & surgery (119). A61M body-fluid devices (60), C12Q enzyme/DNA assays (33), H01M batteries (33), B01L lab apparatus (16) and B82Y nanotechnology (9) each represent a narrower, more specialized claim set rather than a competing mainstream.
Shares are the percentage of the 508 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Electrochemical Impedance Spectroscopy with Eureka
This page is one run against one query. Ask Eureka your own question about electrochemical impedance spectroscopy and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited and most recent filings
Reference electrode design for electrochemical impedance spectroscopy (EP4421484B1)
Filed by Martin-Luther-Universität Halle-Wittenberg, this filing addresses reference electrode construction specifically for EIS measurement setups — a foundational, instrumentation-level claim rather than an application-specific one.Publication date 2026-08-05, near the dataset's cut-off, so citation and prosecution history are not yet developed.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7985330B2 | Method and system for detecting age, hydration, and functional states of sensors using electrochemical impeda… | 555 |
| 2 | US8114268B2 | Method and system for remedying sensor malfunctions detected by electrochemical impedance spectroscopy | 516 |
| 3 | US20080000779A1 | Method and System for Remedying Sensor Malfunctions Detected by Electrochemical Impedance Spectroscopy | 229 |
| 4 | US5859537A | Electrochemical sensors for evaluating corrosion and adhesion on painted metal structures | 114 |
| 5 | US20070170073A1 | Method and System for Detecting Age, Hydration, and Functional States of Sensors Using Electrochemical Impeda… | 108 |
| 6 | US6313646B1 | In-situ electrochemical-based moisture sensor for detecting moisture in composite and bonded structures | 89 |
| 7 | US20130069660A1 | Method for in situ battery diagnostic by electrochemical impedance spectroscopy | 87 |
| 8 | US5086274A | Variable frequency magnetic field device employing multiple antennae for measuring the surface impedance of a… | 71 |
| 9 | US6151969A | Electromechanical and electrochemical impedance spectroscopy for measuring and imaging fatigue damage | 65 |
| 10 | US20120061257A1 | Concentric bipolar electrochemical impedance spectroscopy to assess vascular oxidative stress | 61 |
Citation counts reward older filings that have had more time to accumulate references; treat them as a measure of influence on later filers, not of present-day relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the data means for filing strategy
Three patterns stand out once family counts, IPC codes and filing years are read together.
The peak has passed, on the record so far
Filings climbed from 36 in 2017 to 50 in 2021, then declined toward the dataset's most recent, still-partial year. Even allowing for publication lag, the drop from the 2021 peak through the 2022 midpoint of 19 signals a maturing rather than accelerating field.
Material-testing claims dominate the corpus
G01N families outnumber the next subclass, G01R, by close to three to one. Anyone filing a pure electrical-measurement claim (G01R) or a battery-diagnostic claim (H01M) is working in a much thinner slice of prior art than a general material-testing claim.
US-first filing strategy, selective extension abroad
United States receiving-office filings more than triple the EPO count and exceed the WIPO PCT track by a wide margin, with India, China and Canada each in the twenties. This is a US-anchored field where international coverage is added selectively rather than as standard practice.
No active leader is compounding filings
Every assignee that shows up in recent-year momentum tracking, including one with a -100% year-on-year change, filed zero families in the latest year. That is consistent with a fragmented ownership base rather than one or two firms pulling ahead.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electrochemical impedance spectroscopy, with the prior art for and against each one.
Who holds the claims, and where the gaps sit
Ownership in this corpus is fragmented rather than concentrated: the strongest co-assignee pairings each recur only seven times, and no single organisation shows sustained recent-year filing.
A small research consortium files together repeatedly
Three co-assignee pairings, each appearing seven times, link the same three Israeli agricultural-research and university technology-transfer organisations. That pattern points to a sustained joint research programme rather than incidental overlap.
Sensor-diagnostics filings set the early reference points
The most-cited records in the corpus, several sharing overlapping inventorship and near-identical titles around sensor age, hydration and malfunction detection via EIS, established the vocabulary that later filers cite against. Their influence is historical: none is a recent filing.
No assignee is currently scaling filings
Every organisation appearing in recent-year momentum tracking — spanning medical device, battery chemistry, and university-affiliated assignees — filed nothing in the latest year. That flat momentum across otherwise different types of organisations reinforces the broader decline seen in the overall filing trend.
| Assignee | Recent year | YoY |
|---|---|---|
| Medtronic MiniMed, Inc. | 0 | -100% |
| Agricultural Research Organization – Volcani Center, Israel Ministry of Agriculture and Rural Development | 0 | — |
| B.G. Negev Technologies and Applications Ltd. | 0 | — |
| Industrial Technology Corporation | 0 | — |
| LG Chem, Ltd. | 0 | — |
| Arizona Board of Regents on behalf of the University of Arizona | 0 | — |
| Delft University of Technology | 0 | — |
| ABDOLAHAD MOHAMMAD | 0 | — |
Turning this landscape into a filing decision
The trend and ownership data narrow down where to look next; the remaining work is claim-level.
Check the thinner IPC branches before drafting
H01M, B01L and B82Y each carry a fraction of G01N's filing volume. A claim drafted specifically for one of these contexts is less likely to run into dense prior art than a general material-testing claim.
Explore IPC white space in EurekaWatch for consortium filings, not just single assignees
The strongest co-assignee links in this corpus are repeated research partnerships rather than solo filers. Tracking which institutions co-file together flags collaborations before they show up as a dominant single owner.
Trace co-assignee networks in EurekaTreat the last two years as incomplete, not declining
Publication lag of roughly 18 months means the most recent filing years will fill in further after this cut-off. Re-check the trend in six to twelve months before concluding the field has cooled permanently.
Set a filing-trend alert in EurekaCommon questions about EIS patents
Most claims in this corpus fall into one of a few buckets: equivalent circuit fitting methods, frequency sweep protocols, reference electrode hardware, or overpotential analysis applied to a specific measurement context. The IPC data shows material analysis and testing (G01N) as the largest category by a wide margin, ahead of electrical measurement (G01R) and medical diagnosis (A61B). A drafter should expect to distinguish a new claim against this material-testing baseline first, since it is where the bulk of prior art sits.
No, not on the current record. Filings rose from 36 in 2017 to a peak of 50 in 2021, then declined toward the low double digits by the most recent, still-partial year. Publication lag of about 18 months means the very last one or two years will fill in somewhat as more applications publish, but the decline from the 2021 peak through the 2022 midpoint of 19 families predates that effect and looks like a genuine slowdown.
Battery and cell diagnostics (H01M) account for only 33 of 508 families in this dataset, a much smaller share than material testing (G01N, 429) or medical diagnosis and body-fluid devices (A61B and A61M, 119 and 60 respectively). Enzyme and DNA-based assay testing (C12Q, 33) and lab apparatus (B01L, 16) also draw on EIS claim language. Anyone assuming this is primarily a battery technology should recheck that assumption against the IPC spread before scoping a search.
The receiving-office data shows the United States taking by far the largest share of filings (233), more than three times the EPO figure (72) and well ahead of the WIPO PCT route (57). India, China and Canada each receive a smaller, roughly similar volume. That pattern suggests the US is the default first-filing jurisdiction for this technology, with international protection added selectively rather than as a standard multi-jurisdiction strategy.
Ownership in this corpus is fragmented: the strongest co-assignee relationships each recur only seven times, and every organisation tracked for recent-year momentum — spanning medical device, battery chemistry and university-affiliated assignees — filed zero families in the latest year, including one with a -100% year-on-year drop. This is not a field with one dominant, currently active filer; it is a wide field of smaller and historical contributors, several linked through repeated research collaborations rather than corporate scale.
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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.