Microencapsulated PCM Patents: Leader, Long Tail & Gaps 2026
- Filing peaked in 2018 at 9 records and has not returned to that level since, with the 2022 midpoint sitting at zero — this is a field that spiked once rather than one that is building steadily.
- Two related US filings dominate citation activity US20180215982A1 and US20180215983A1, both titled "Encapsulates," drawing 17 and 16 citations respectively — most influence in this corpus traces back to one filing family.
- B01J and C09K classes cover 92.3% of the 13 records while F28D heat-exchange integration sits at just 38.5% — the chemistry of the capsule is heavily claimed, its use in heat-exchange hardware much less so.
What this landscape covers
Microencapsulated phase change materials (PCMs) wrap a heat-storing core — typically a paraffin or salt hydrate — in a polymer or inorganic shell, so the material can absorb and release latent heat without leaking as it cycles between solid and liquid states. The patent activity captured here sits at the intersection of shell chemistry, encapsulation ratio and supercooling control, and thermal conductivity enhancement in the resulting composite. This scope excludes broader PCM formulation work that does not address encapsulation, shell integrity after cycling, or leakage prevention specifically.
The 13 records in scope span receiving offices in Europe, India, the United States, Canada and the WIPO PCT route, with no single office dominating filings. Because publication typically lags filing by around 18 months, the most recent years in the trend understate actual filing activity and should be read as provisional.
Filing trend and technology composition
The trend line and the IPC breakdown below are drawn from the same 13-record dataset that underlies every other section on this page.
A single spike, not a steady climb
Filing activity reached its peak of 9 records in 2018, then fell away; by the 2022 midpoint the count was back to zero. That pattern reads more like a burst of activity around one filing family than a technology building sustained momentum — worth checking against the most recent 18 months of filings, which are still incomplete in this dataset.
Shell chemistry is claimed far more than system integration
B01J (chemical/physical processes) and C09K (materials for miscellaneous applications) each cover 92.3% of the 13 records, confirming that most filings are about the capsule itself — its formation, shell material and stability. F28D, covering heat-exchange apparatus, appears in only 38.5% of records, and C08L polymer compositions and C01B inorganic compounds each sit at 15.4%. H01L and H02K — semiconductor and electric-motor thermal management — each appear in a single record.
Shares are the percentage of the 13 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Microencapsulated Phase Change Materials with Eureka
This page is one run against one query. Ask Eureka your own question about microencapsulated phase change materials and every answer comes back with the patent numbers behind it.
Try EurekaThe records anchoring this landscape
CA3046510A1 — Microencapsulated Phase Change Material (Encapsys, LLC, 2018-08-02)
The filing discloses a microencapsulated phase change material characterised by a specific Thermal Efficiency Index (TEI), built from weighted parameters covering thermal response, humidity resistance, melting point, thermogravimetric stability and formulation weight. The stated aim is a commercially useful capsule with a defined combination of physical and chemical characteristics, delivering better thermal performance than conventional microcapsules.The TEI construct is the distinctive element: it claims a compound performance metric rather than a single material or process step, which shapes how narrowly or broadly the claim can be designed around.
View full filing| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180215982A1 | Encapsulates | 17 |
| 2 | US20180215983A1 | Encapsulates | 16 |
| 3 | WO2018140710A1 | encapsulates | 2 |
Citation counts inside a searched corpus favour older filings; treat them as a signal of influence within this dataset, not as a measure of current commercial importance.
Publication numbers are shown where the record carries one (3 of 3 rows); clicking a row searches Eureka by that number.
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Three patterns stand out once the ranking, the trend and the IPC composition are read together.
One filer, then a long tail
The ranking of 9 assignees shows a clear leader ahead of a fifth-place assignee holding just 1 record. That gap is steep for a field this small, and it means most of the ranked names are single-filing entrants rather than repeat players — worth checking each one's broader portfolio outside this exact search scope before assuming they are inactive.
No assignee shows recent-year activity
Every assignee in the recent-year momentum table, including the leader, shows zero filings in the latest tracked year. Combined with the 2018 peak and 2022 midpoint of zero, this points to a field that had a defined burst of activity rather than one currently accelerating — though the 18-month publication lag means the very latest filings may simply not be visible yet.
Integration claims are thinner than material claims
With B01J and C09K each covering 92.3% of records, the shell material and encapsulation process are heavily claimed. F28D — the class covering heat-exchange apparatus that would use the PCM capsules in a working system — appears in well under half of records, suggesting device-level integration claims face less prior art than the core microcapsule chemistry.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to microencapsulated phase change materials, with the prior art for and against each one.
Who holds the claim space
The ranking below covers all 9 assignees the data endpoint returns for this search — it is not a top-50 or top-100 cut, so a single-record fifth-place entry is a genuine reflection of a small, fragmented field rather than a truncated list.
A clear leader in a shallow field
The top-ranked assignee holds 9 of the records captured, well ahead of the rest of the ranking. Co-assignee pairings show this leader appearing alongside several individual co-inventors across separate filings, rather than one fixed research partner.
Collaboration is individual-scale, not institutional
The 10 co-assignee pairs recorded are each weighted at 1, and the strongest pairings link the same corporate leader to different named individuals rather than to other companies or universities. That pattern is consistent with sponsored or contract research rather than joint corporate ventures.
Filing is spread across offices, not concentrated in one
Receiving offices split fairly evenly: Europe, India and the United States each show 3 records, Canada 2, and the WIPO PCT route 2. No single jurisdiction anchors this field, which matters for freedom-to-operate checks — a clearance search limited to one office would miss a meaningful share of the prior art.
| Assignee | Recent year | YoY |
|---|---|---|
| Encapsys, LLC | 0 | — |
| INDIAN INST OF TECHNOLGOY ROORKEE | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| ZHONG LING | 0 | — |
| YANG YUYING | 0 | — |
| SRM INST OF SCI & TECH | 0 | — |
| REN HUA | 0 | — |
| PAN FUYU | 0 | — |
Where to take this analysis
The landscape here is a starting point for scoping a filing or freedom-to-operate question, not a substitute for a full clearance search.
Check the leader's wider portfolio
The top-ranked assignee's 9 records here are bounded by this search's IPC and keyword scope. A broader pull against the same assignee name would show whether their PCM work extends into adjacent classes not captured in this dataset.
Explore assignee portfolios in EurekaTest claims against the two dominant citation anchors
US20180215982A1 and US20180215983A1 draw the most citations in this corpus. Any new filing in shell chemistry or encapsulation ratio should be checked against both before drafting claims.
Run a citation check in EurekaScope a filing in the under-claimed branches
F28D heat-exchange integration and the semiconductor/motor thermal-management classes carry markedly lower filing density than the core shell-chemistry cluster. That gap is worth validating with a fresh search before committing R&D time.
Search white space in EurekaCommon questions on this landscape
This dataset's assignee ranking returns 9 companies and individual filers across 13 total published records. That is a small, fragmented field: one assignee holds 9 records while the fifth-ranked entry holds just 1, so most of the ranked names are single-filing participants rather than repeat filers. Before concluding the field is this narrow, it is worth widening the search terms and IPC scope, since this ranking reflects one specific keyword and classification query rather than every PCM-related filing globally.
The trend in this dataset shows 2018 as the peak year with 9 records, followed by a decline to zero at the 2022 midpoint and no recovery through the most recent tracked year. This pattern is consistent with a concentrated filing event, likely tied to one assignee's active period, rather than sustained industry-wide investment. Readers should also account for the roughly 18-month lag between filing and publication, which means the last one to two years in any trend chart are understated and should not be read as a genuine falloff until confirmed by later data.
Shell chemistry and the encapsulation process itself are the most heavily claimed areas: B01J (chemical and physical processes) and C09K (materials for miscellaneous applications) each cover 92.3% of the 13 records in this dataset. By contrast, F28D, the class covering heat-exchange apparatus that would put these capsules into a working thermal system, appears in only 38.5% of records. That gap suggests the core microcapsule material is well-covered by prior art, while claims on how the capsules are integrated into heat-exchange hardware face less competition.
CA3046510A1, filed by Encapsys, LLC, claims a microencapsulated phase change material defined by a composite Thermal Efficiency Index built from thermal response, humidity resistance, melting point, thermogravimetric stability and formulation weight parameters. Because the claim is structured around a compound performance metric rather than a single material composition or process step, it is narrower than it first appears — a formulation that scores differently on any one of those weighted parameters may sit outside the claim. Anyone developing a competing microcapsule should model their material against each named parameter individually rather than assuming the whole claim is a blanket bar.
The clearest gaps sit outside the dominant B01J/C09K shell-chemistry cluster: heat-exchanger-integrated PCM capsules (F28D) appear in only 38.5% of the 13 records, and semiconductor thermal management (H01L) and electric motor or generator cooling (H02K) each appear in just a single record. These are system-integration applications of an already-encapsulated material rather than new shell chemistries, which typically means fewer competing claims and more room to file on the specific engineering of how the capsule is deployed in a device.
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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.