Wafer Inspection Patents: Leaders, Trends & White Space 2026
- Filing has cooled since its 2017 peak. 27 families filed that year against a flat-to-declining midpoint of 8 in 2022, with 2026 too early to read.
- Claim density sits overwhelmingly in G01N. 334 of 353 families touch material analysis and testing, with H01L semiconductor-device claims a distant second at 146.
- The US is the dominant filing venue by a wide margin. 166 US-directed records compare with 54 in Israel and 30 at the EPO, showing where enforcement risk concentrates.
Filing growth compares 2021 (7 records) with 2024 (9) — 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 353 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Wafer inspection and defect metrology patents cover the tools and methods used to find, classify and quantify defects on semiconductor wafers before they become yield losses further down the line. This dataset pulls 353 patent families filed or published between 2015 and mid-2026, searched across optical inspection, defect classification, yield learning, overlay measurement and critical-dimension claim language. The technology sits at the intersection of material analysis (G01N), semiconductor device structure (H01L), and image processing (G06T) — a combination that reflects how modern inspection tools pair optical or electron-beam hardware with automated classification software.
Because publication lags filing by roughly eighteen months, the apparent falloff toward 2026 understates real filing activity in the most recent two years; treat the tail of any trend chart as provisional rather than as evidence of a slowdown.
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Filing trends and technology composition
Two views of the same 353 families: how filing activity moved year over year, and which IPC subclasses carry the claim weight.
Filing trend
Filings peaked at 27 in 2017 and eased toward a midpoint of 8 by 2022, a flat-to-declining pattern rather than a growth curve. Readers should discount the final one to two years of any chart for publication lag before concluding the field is contracting.
IPC composition
G01N (material analysis and testing) dominates at 334 of 353 records, with H01L (semiconductor devices, 146), G06T (image processing, 65) and G01B (dimensional measurement, 54) forming a second tier. G03F (photolithography, 20) and G01R (electric and magnetic measurement, 26) are the smallest slices, suggesting less-crowded claim territory at the lithography-metrology and electrical-test boundary.
Shares are the percentage of the 353 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Wafer Inspection and Defect Metrology with Eureka
This page is one run against one query. Ask Eureka your own question about wafer inspection and defect metrology and every answer comes back with the patent numbers behind it.
Try EurekaFoundational filings and what they still cover
Wafer inspection methods and an optical inspection tool
The filing describes generating a reference wafer, polishing it through a chemical-mechanical process following metal deposition so it represents a fully polished wafer, then scanning it with an optical inspection tool to produce a gray-level map. Further wafers are metalized, polished and scanned in the same way, and their gray-level maps are compared against the reference map to determine defect status.Filed by Applied Materials, Israel Ltd. — published 2004-02-12.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6324298B1 | Automated wafer defect inspection system and a process of performing such inspection | 370 |
| 2 | US4644172A | Electronic control of an automatic wafer inspection system | 301 |
| 3 | US5761064A | Defect management system for productivity and yield improvement | 263 |
| 4 | US4618938A | Method and apparatus for automatic wafer inspection | 262 |
| 5 | US6288780B1 | High throughput brightfield/darkfield wafer inspection system using advanced optical techniques | 222 |
| 6 | US4818169A | Automated wafer inspection system | 202 |
| 7 | US20130016346A1 | Wafer Inspection | 159 |
| 8 | US6937753B1 | Automated wafer defect inspection system and a process of performing such inspection | 143 |
| 9 | US20010012069A1 | Confocal microscope with a motorized scanning table | 130 |
| 10 | US20020109110A1 | Laser scanning wafer inspection using nonlinear optical phenomena | 116 |
Citation counts inside a searched corpus favour older filings; treat them as a signal of influence on later art, not a ranking of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once family counts, IPC spread and venue data are read together.
Activity has cooled from its peak
Filings ran at 27 in 2017 and had eased to a midpoint of 8 by 2022, a flat-to-declining trend rather than sustained growth. That does not mean the field is closed — recent-year momentum figures for tracked assignees also read near zero, which is consistent with publication lag rather than an actual stop in R&D.
Material analysis claims dominate the space
Nearly every family in this dataset sits at least partly in G01N, the material-analysis and testing subclass. H01L device claims and G06T image-processing claims form a real but much smaller second layer, meaning new entrants competing purely on inspection method face the densest prior art.
US filings carry the enforcement weight
The United States receives more than three times the filings of the next-largest office, Israel, with Europe and WIPO trailing further behind. Freedom-to-operate work that skips a US clearance search is skipping the venue where most of this art was actually filed.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to wafer inspection and defect metrology, with the prior art for and against each one.
Who holds the ground
Recent-year momentum across the tracked assignees reads at or near zero across the board, including a documented -100% year-on-year move for Applied Materials Israel — consistent with the broader cooling trend and with publication lag masking the newest filings.
Momentum has flattened across the leaderboard
Every assignee tracked for recent-year momentum, including the most historically active filers, shows zero filings in the latest tracked year. That is consistent with an 18-month publication lag rather than a sudden halt in R&D, but it means the current public record understates what is actually in the pipeline.
Co-filing is limited and concentrated
Only ten co-assignee pairs appear in this corpus, and the strongest of them cluster around a single organisation filing jointly with named individual inventors rather than broad multi-company alliances. That points to a field where IP is built mostly in-house rather than through joint development deals.
The oldest filings still anchor the art
The most-cited records in this corpus date back to the 1980s and 1990s automated wafer inspection systems, and they still accumulate citations well ahead of anything filed in the last decade. New filings are being written against, and around, claim language set decades ago.
| Assignee | Recent year | YoY |
|---|---|---|
| KLA Corporation | 0 | — |
| Camtek Ltd. | 0 | — |
| Applied Materials, Inc. | 0 | — |
| Nanda Technologies | 0 | — |
| Applied Materials, Israel Ltd. | 0 | -100% |
| Negevtech Ltd. | 0 | — |
| August Technology Corporation | 0 | — |
| Rudolph Technologies, Inc. | 0 | — |
Where to take this next
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, licensing, or new product filing.
Run a freedom-to-operate check against the US corpus
With 166 of 353 families directed at the US office, any inspection or metrology product headed for that market should be checked against this set before committing to a claim strategy.
Explore FTO workflowsProbe the under-claimed branches directly
Electron-beam overlay correction and lithography-linked defect classification show noticeably thinner filing density than the core G01N cluster — worth a dedicated search before assuming the space is occupied.
Search white space in EurekaTrack the pipeline behind the publication lag
Because every tracked assignee shows zero filings in the latest year, the real competitive picture for 2025-2026 is still emerging in the data. Set up an alert rather than reading the current trend line as final.
Set up a monitoring alertCommon questions about wafer inspection patents
The assignee ranking in this dataset is dominated by companies with long histories in semiconductor process equipment, alongside specialised metrology firms. Rather than a single runaway leader, the field shows filing activity spread across a handful of established equipment makers plus a long tail of single-filing entrants. Recent-year momentum has flattened across nearly all tracked assignees, which is more a reflection of publication lag than of any single company stepping back from R&D.
Filings in this dataset ran at 27 in 2017 and had eased to a midpoint of 8 by 2022, a flat-to-declining pattern rather than continued growth. Part of that apparent decline is real cooling in a maturing claim space, but part of it is an artefact of publication lag — patents filed in the last 18 months typically have not published yet, so the most recent years in any chart will always look thinner than they eventually turn out to be. Readers should treat the 2024-2026 tail as provisional.
G01N, covering material analysis and testing, appears in 334 of the 353 families in this dataset, making it the single most important classification to search. H01L (semiconductor devices, 146 records), G06T (image processing, 65) and G01B (dimensional measurement, 54) form a meaningful second tier. Smaller classes like G03F (photolithography) and G01R (electric and magnetic measurement) carry fewer filings and may represent comparatively open claim territory for adjacent innovations.
US6324298B1, titled 'Automated wafer defect inspection system and a process of performing such inspection,' is the most-cited record in this corpus with 370 citations. Its influence reflects its early priority date on automated inspection methods rather than current commercial dominance — high citation counts inside a searched corpus tend to favour older filings simply because they have had more time to accumulate references. It remains a useful reference point for understanding the baseline claim language that later filings had to work around.
The thinnest filing density in this dataset sits at the edges of the dominant G01N and H01L cluster, particularly around electron-beam overlay correction, in-line critical-dimension drift compensation, and defect classification methods that cross into photolithography (G03F) claim language. These branches show materially fewer filings than the core optical-inspection and defect-classification space. A search focused specifically on these adjacent areas is more likely to surface open claim territory than a broad search across the whole corpus.
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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.