Thermal Interface Materials Patents: Who Leads, Where the Gaps Are 2026
- Six assignees hold the entire scope. the ranked leaders account for all 16 records in this dataset, with the top five alone covering 93.8% of them.
- Filing peaked in 2021 at 8 records and has gone flat since. the 2022 midpoint shows zero, and the most recent year is still catching up to reporting lag.
- Every record touches semiconductor packaging. 100% of records sit in H01L, with H10W close behind at 68.8% — this is a packaging-adjacent field, not a bulk-materials one.
What the patent record shows
Thermal interface materials sit at the junction of materials chemistry and semiconductor packaging: the claims in this dataset cluster around bond line thickness control, pump-out and dry-out resistance, and reliability after thermal cycling — the practical failure modes that determine whether a TIM survives years in the field rather than just a datasheet test. The search scope here is narrow and claim-specific, built around IPC classes C09K5, H01L23 and C08K3, which is why the total record count is small relative to broader materials searches.
That narrowness is informative on its own. A field with only 16 records in scope, concentrated among six assignees, is not a crowded commodity space — it is a small set of packaging-integration claims where the die-to-heat-spreader interface has been fought over by a handful of semiconductor and materials companies rather than a wide field of specialty chemical suppliers.
Filing trend and technology composition
Two views of the same 16-record dataset: how filing activity moved year over year, and which IPC subclasses the claims actually sit in.
Filing activity, 2017–2026
Filing rose to a peak of 8 records in 2021, then fell away — the 2022 midpoint shows zero and the curve has stayed flat or declining since. Because publication typically lags filing by roughly 18 months, the most recent year understates true filing activity and should not be read as the field going quiet in real time.
Technology composition by IPC subclass
Every record in scope (100.0% of 16) carries an H01L semiconductor-devices classification, and 68.8% also carry H10W — confirming this is fundamentally a packaging claim set. H05K (printed circuits and assemblies) appears in half the records, while B23K (welding, soldering and brazing) appears in only one, marking it as a minor, adjacent classification rather than a core route.
Shares are the percentage of the 16 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Thermal Interface Materials with Eureka
This page is one run against one query. Ask Eureka your own question about thermal interface materials and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited claims in this space
US6867978B2 — Integrated heat spreader package for heat transfer and for bond line thickness control
A system includes a thermal interface material (TIM) to transfer heat from a die to a heat spreader. The system includes a heat transfer subsystem disposed on the backside surface of the die. In one embodiment, the heat transfer subsystem comprises a first heat transfer material and a second heat transfer material discretely disposed within the first heat transfer material. A method of bonding a die to a heat spreader uses a die-referenced process as opposed to a substrate-referenced process.Filed by Intel Corporation; the single most-cited record in this dataset at 66 citations, and the anchor claim for bond line thickness control as a distinct engineering problem.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6867978B2 | Integrated heat spreader package for heat transfer and for bond line thickness control and process of making | 66 |
| 2 | US20210378106A1 | Methods And Heat Distribution Devices For Thermal Management Of Chip Assemblies | 38 |
| 3 | US10720417B2 | Thermally enhanced fully molded fan-out module | 11 |
| 4 | US11990386B2 | Methods and heat distribution devices for thermal management of chip assemblies | 3 |
| 5 | US20210066162A1 | Semiconductor package with attachment and/or stop structures | 3 |
| 6 | US10418309B1 | Mechanical seal and reservoir for microelectronic packages | 3 |
| 7 | US20240243091A1 | Phase changing thermal interface material alloy created in-situ | 1 |
Citation counts favour older filings in any searched corpus — treat them as a signal of influence on subsequent filers, not as a measure of current commercial importance.
Publication numbers are shown where the record carries one (7 of 7 rows); clicking a row searches Eureka by that number.
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Three patterns stand out once the ranking and the trend line are read together: the field is small, one filer's claims sit at the centre of the citation graph, and filing has not restarted since its 2021 peak.
A handful of filers cover almost the whole field
The top five assignees combined account for 93.8% of all 16 records in scope, and all six ranked assignees together cover 100.0%. There is no long tail of small independent filers here — this is a field defined by a small number of semiconductor and materials companies, not a fragmented commodity space.
Filing has not recovered since its 2021 high
The trend line peaks at 8 records in 2021 and drops to zero at the 2022 midpoint, staying flat or declining through the most recent reported year. Given the typical 18-month lag between filing and publication, the latest year is understated, but the multi-year plateau before it is a real signal that new claim activity has slowed.
This is a packaging problem before it is a materials problem
Every record in scope carries an H01L semiconductor-devices classification, and 68.8% also carry H10W. H05K appears in half the dataset. Claims here are being drafted around die, heat-spreader and package integration — not around bulk thermal conductivity chemistry in isolation.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to thermal interface materials, with the prior art for and against each one.
Who holds the claims, and where the gate sits
Six assignees account for every record in scope. The leader alone holds 8 of the 16 records; fifth place holds just 1 — a steep drop-off rather than a gradual one.
One filer's claims anchor the field
The leading assignee holds 8 of the 16 records in scope — half the entire dataset. Combined with the citation weight sitting on the same company's earliest filing, this is a field where one party's claim language has effectively set the vocabulary that later filers had to draft around.
The ranking falls away sharply after the leader
Fifth place in the ranking holds only 1 record, a steep drop from the leader's 8. This is not a gradual long tail — it is a small set of companies each defending a narrow slice of claim space around the same packaging problem.
Filing activity is concentrated in the US
Of the receiving offices recorded, the United States accounts for 10 filings, ahead of the EPO at 3, Singapore at 2 and Austria at 1. For a field this small, that skew suggests the commercial and litigation stakes are currently seen as a US packaging-market issue first.
| Assignee | Recent year | YoY |
|---|---|---|
| Google LLC | 0 | — |
| Intel Corporation | 0 | — |
| BorgWarner US Technologies LLC | 0 | — |
| Indium Corporation | 0 | — |
| Deca Technologies Inc. | 0 | — |
| Sunwei Technology Co., Ltd. | 0 | — |
Where to take this
The dataset points to a field with a settled core claim and thin coverage at its edges. Two directions are worth pursuing before committing to a filing or design-around strategy.
Check freedom-to-operate against the leader's core claim
With one assignee holding half the records and the field's most-cited patent, any new TIM packaging claim should be checked against that filer's bond line thickness control language before drafting continues.
Run a freedom-to-operate search in EurekaProbe the under-claimed sub-areas directly
Silicone-free formulations and pump-out resistance under cycling show thin density in this scope. A targeted novelty search on those branches specifically, rather than the field as a whole, is more likely to surface open claim space.
Explore white space in EurekaCommon questions about thermal interface material patents
In this dataset the leading assignee holds 8 of the 16 records in scope, roughly half the entire field, with the next four ranked assignees combining with it to cover 93.8% of all records. The drop-off is steep: fifth place holds only 1 record. Because the search scope here is narrow — built around bond line thickness control, pump-out/dry-out and thermal cycling reliability claims — this ranking should be read as who dominates that specific claim territory, not the broader TIM materials market as a whole.
The filing trend peaked at 8 records in 2021 and has been flat or declining since, with the 2022 midpoint showing zero. Publication typically lags filing by around 18 months, so the most recent year understates real activity and should not be read as a hard stop. But the multi-year plateau before the most recent year is a genuine signal that new claim filing in this narrow scope has slowed rather than accelerated.
The search scope centres on four specific failure and design problems: the trade-off between bulk conductivity and contact resistance, pump-out and dry-out of the interface material over time, controlling bond line thickness during die-to-heat-spreader assembly, and reliability after repeated thermal cycling. Every record in this dataset carries an H01L semiconductor-devices classification, and most also carry H10W, which confirms these are packaging-integration claims rather than standalone materials-chemistry claims.
Yes, in specific branches. Silicone-free formulations and pump-out resistance under cycling both show thin claim density relative to the core bond-line-thickness-control claims that dominate the dataset, and B23K-classified welding/brazing-based die attach appears in only one of the 16 records. These are the sub-areas most likely to reward a targeted novelty search rather than the field's central claim, which is already anchored by one highly cited patent.
US6867978B2, assigned to Intel Corporation, is the most-cited record in this dataset at 66 citations and covers an integrated heat spreader package with bond line thickness control. It functions as the field's anchor claim: later filings on die-referenced thermal interface assembly have largely had to draft around its language. Anyone entering this space should review it early, since high citation count in a searched corpus signals influence on later filers even though it does not by itself indicate current market dominance.
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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.