Thermal Insulation Patents: Top Companies & Filing Trends 2026
- No single filer dominates. the ranked leader holds 3,107 records and the top 10 combined account for just 7.2% of all 178,977 records in scope — this is a fragmented field, not a gatekept one.
- Filing has cooled from its 2019 peak. activity ran 938 records at the high point and fell from 915 in 2021 to 680 in 2024, a 26% decline over that span, though 2025-26 figures are still filling in.
- No IPC subclass exceeds 1%. the densest class, F28D heat-exchange apparatus, covers only 0.9% of records — claim space is spread thin across heat exchange, refrigeration, batteries, piping and temperature sensing rather than concentrated in one branch.
Filing growth compares 2021 (915 records) with 2024 (680) — 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 178,977 records in scope (CR5), not by the ranked leaders only.
What the thermal insulation patent record actually shows
The search spans 178,977 published records from 2015 through the 2026 data cut-off, combining thermal insulation and insulating-material claims with the sensing and thermal-cycling language that surrounds real deployments — temperature sensors, heat flux, vapor compression, working fluid. That pairing matters: a materials claim without a control or measurement context reads very differently to an examiner than one filed alongside a heat-flux sensor or a vapor-compression cycle.
Filing activity peaked in 2019 at 938 records and has since eased, with the most recent complete year (2024) sitting 26% below 2021. Publication lags filing by roughly 18 months, so the 2025-26 figures shown in the trend will keep revising upward and should not be read as a slowdown in current filing.
Filing trend and technology composition
Two views of the same 178,977-record corpus: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A cooling trend off a 2019 peak
From 879 records in 2017 to a peak of 938 in 2019, filings eased to 680 by 2024 — a 26% drop from the 2021 level of 915. The 2025 and 2026 counts (down to 67 for the partial latest year) are not yet complete because of publication lag, not falling interest.
No dominant technology branch
F28D (heat-exchange apparatus) leads at 0.9% of all records, with F25D refrigeration, H01M batteries, F16L piping and G01K temperature measurement each near 0.6-0.7%. Because records carry multiple IPC classes, these shares sum to more than the record total — the takeaway is breadth, not a single crowded core.
Shares are the percentage of the 178,977 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Thermal Insulation Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about thermal insulation patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaA representative record: non-invasive thermal interrogation
US11686626B2 — Apparatus, systems, and methods for non-invasive thermal interrogation (Thermasense Corp., 2023-06-27)
Non-invasive sensors placed on an object's surface combine a heat flux sensor and a temperature sensor to infer internal temperature distribution and internal properties from surface thermal signals, without needing direct access to the internal region.The claim value sits in pairing surface-level heat flux and temperature measurement to infer internal state — a sensing architecture rather than an insulation material claim.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5855680A | Apparatus for growing thin films | 970 |
| 2 | US6045240A | LED lamp assembly with means to conduct heat away from the LEDS | 884 |
| 3 | US4194536A | Composite tubing product | 833 |
| 4 | US5475610A | Thermal cycler for automatic performance of the polymerase chain reaction with close temperature control | 796 |
| 5 | US7329257B2 | Medical treatment instrument | 789 |
| 6 | US6847014B1 | Method and apparatus for controlling the spatial temperature distribution across the surface of a workpiece s… | 752 |
| 7 | US3949388A | Physiological sensor and transmitter | 739 |
| 8 | US20030171747A1 | Medical treatment instrument | 688 |
| 9 | US5653239A | Continuous temperature monitor | 683 |
| 10 | US5542928A | Method and device for thermal ablation having improved heat transfer | 662 |
Citation counts favour older filings that have had more time to accumulate citations within this corpus — treat them as a signal of influence, not current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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The ranking and class data point to a field where breadth, not blocking density, is the defining feature.
Leadership is real but thin
The leading assignee holds 3,107 records and the top 10 combined account for 7.2% of all 178,977 records in scope. That is enough to shape a few sub-areas but far from enough to block entry across the field — most of the corpus sits with entities outside the ranked leaders.
Past-peak, not abandoned
Filings peaked in 2019 at 938 and have eased since, with 2024's 680 records sitting 26% below 2021's 915. That is a real cooling in a mature filing base, not evidence the technology has stalled — publication lag means the last two years will revise upward.
Claim space is spread, not stacked
No IPC subclass exceeds 1% of the 178,977 records in scope. Heat exchange, refrigeration, batteries, piping and temperature sensing each carry a similar, modest share — a filer entering any one of them is not walking into a single dominant thicket.
US leads filing venue by a wide margin
The United States receives more than double the next-largest venue (EPO at 4,009), with PCT, Australia, the UK and Canada trailing further behind. Venue choice signals where applicants expect enforcement value, not where R&D originates.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to thermal insulation patent landscape, with the prior art for and against each one.
Who is filing, and where the field is still open
The ranked leaders hold a modest combined share, and recent-year momentum figures show several established filers pulling back rather than accelerating.
A leader without a lock
The top-ranked assignee's 3,107 records make it the largest single filer, but that is a small fraction of 178,977 records in scope — no single company's portfolio defines this field's boundaries.
Established filers are pulling back
Several ranked assignees show sharp year-over-year declines in the latest year, including one at -94% and another at -100%, with multiple others recording zero filings in the latest period. This reads as portfolio consolidation among incumbents rather than field-wide exit.
Co-filing is limited and concentrated
Only 10 co-assignee pairs appear in the corpus, with the strongest link tied to one organisation and its research affiliate. Cross-company joint filing is the exception here, not the norm.
| Assignee | Recent year | YoY |
|---|---|---|
| LG Electronics Inc. | 1 | -94% |
| Samsung Electronics Co., Ltd. | 1 | -75% |
| Shell Oil Company | 0 | — |
| Mitsubishi Electric Corporation | 0 | — |
| General Electric Company | 0 | — |
| Rondo Energy, Inc. | 0 | -100% |
| Koninklijke Philips N.V. (Royal Philips) | 0 | -100% |
| Denso Corporation | 0 | — |
Where to take this analysis
The dataset points to specific sub-areas and filers worth deeper review before committing a filing or freedom-to-operate position.
Map the under-claimed branches in detail
Low IPC share does not mean no prior art — it means less of it. Pull the full claim set for candidate sub-areas like heat-flux-integrated insulation before drafting.
Explore white space in EurekaWatch the pull-back among incumbents
Several established filers show sharp year-over-year declines. That can mean a shift to trade secrecy, licensing, or genuine deprioritisation — worth confirming before assuming the space is clear.
Track assignee momentum in EurekaCommon questions on the thermal insulation patent landscape
The leading assignee in this dataset holds 3,107 records, well ahead of the fifth-ranked assignee at 1,058 and the tenth at 669. Even so, the top 10 combined account for only 7.2% of the 178,977 records in scope, so no single company controls the field. Any freedom-to-operate review should look beyond the leaders to the long tail, since most of the corpus sits with assignees outside the ranked top 10.
Filing peaked in 2019 at 938 records and has since eased, with the most recent complete year, 2024, sitting 680 records — 26% below the 2021 level of 915. That is a genuine cooling among an established filing base, not evidence of technology decline. Note that publication lags filing by around 18 months, so the 2025-26 counts in any trend chart will keep revising upward and should not be read as the current trajectory.
No single IPC subclass dominates: F28D (heat-exchange apparatus) leads at 0.9% of all 178,977 records, closely followed by F25D refrigeration, H01M batteries, F16L piping and G01K temperature measurement, each around 0.6-0.7%. Because a single record can carry several IPC codes, these shares sum to more than 100% of the corpus. The practical read is that claim activity is distributed across heat exchange, refrigeration, energy storage, piping and sensing rather than stacked in one branch.
The IPC data shows every subclass sitting under 1% of records, which means no branch is heavily blocked, but a few crossover areas stand out as genuinely thin: heat-flux and temperature dual-sensing for non-invasive interrogation, insulation integrated with battery thermal management, and pipe-integrated insulation with embedded thermal cycling control. These sit at the intersection of two low-density classes rather than inside one crowded core, which typically means fewer competing claims to design around. A prior-art search scoped tightly to the crossover language, not just the parent classes, is the right next step.
US11686626B2, assigned to Thermasense Corp. and issued in 2023, claims non-invasive sensor systems that pair a heat flux sensor with a temperature sensor on an object's surface to infer internal temperature distribution without accessing the interior. It is a sensing-architecture claim, not a materials or insulation-composition claim, so it primarily constrains non-invasive dual-sensor interrogation designs rather than insulation material formulations generally. Anyone building surface-based internal-state inference for thermal applications should review its specific claim language for sensor placement and signal-combination limitations before finalising a design.
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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.