Commercial Refrigeration Patents: Leaders & White Space 2026
- Filing has already peaked. Activity crested at 9 families in 2019 and has not returned to that level since, with the 2022 midpoint sitting at 6.
- China now leads the filing offices. 24 of the tracked receiving-office filings are Chinese, more than double the EPO's 11 and well ahead of the US and PCT route at 8 each.
- Momentum has stalled across the named assignees. Every tracked assignee, including Honeywell and DuPont-linked entities, shows zero filings in the latest year.
What this patent set covers
This landscape tracks 69 patent families filed between 2015 and mid-2026 at the intersection of commercial refrigeration and three specific technical routes: CO2 transcritical refrigeration, cascade refrigeration, and the supporting subsystems that make either one commercially workable — ejectors, gas coolers, defrost strategy, leak detection and energy consumption controls. The search deliberately narrows to F25B9, F25B40 and F25D21, the IPC subclasses that cover refrigeration cycle architecture and defrost/energy management, rather than refrigeration broadly.
Because publication typically lags filing by around 18 months, the 2025 and 2026 counts in the trend chart are undercounts of true filing activity, not a real drop-off in R&D. The composition data still points to a field whose activity is concentrated in cycle-architecture claims rather than materials or controls.
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Filing trend and technology composition
Two views of the same 69-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A peak in 2019, no clear rebound since
Filings ran from 1 tracked family in 2017 to a peak of 9 in 2019, dropping back toward a midpoint of 6 by 2022. The most recent year is partial and should be read as a floor, not a signal of decline, given publication lag.
F25B dominates; C09K materials claims are the largest adjacent bucket
68 of 69 records sit in F25B (refrigeration and heat pump cycles), confirming this is a cycle-architecture-heavy dataset. C09K (refrigerant and working-fluid materials) accounts for 15 records, the largest secondary cluster, while F25D (cooling appliances), F25J (gas liquefaction), and single-digit counts in B01J, C10G, C23C and G05B show controls, coatings and catalysis are only lightly claimed.
Shares are the percentage of the 69 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Commercial Refrigeration Systems with Eureka
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Try EurekaThe prior art shaping this space
WO2023079114A1 — Cascade Refrigeration System (Maersk Container Industry)
The application describes a two-cycle cascade refrigeration system for a transport unit: a first refrigeration cycle with its own compressor and expansion valve, a second refrigeration cycle with its own compressor and expansion valve, and a cascade heat exchanger that links the condenser side of the first cycle to the evaporator side of the second. The architecture is built specifically for transport-unit cooling rather than fixed commercial installations.Filed 2023-05-11 · Applicant: Maersk Container Industry A/S
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US3817046A | Absorption-multicomponent cascade refrigeration for multi-level cooling of gas mixtures | 67 |
| 2 | US6519967B1 | Arrangement for cascade refrigeration system | 28 |
| 3 | US20030024262A1 | Arrangement for cascade refrigeration system | 23 |
| 4 | US9657977B2 | Cascade refrigeration system with modular ammonia chiller units | 21 |
| 5 | CN113175762A | 一种两相喷射器增效自复叠制冷循环系统及控制方法 | 13 |
| 6 | CN204478572U | 一种二氧化碳与氟复叠制冷及融霜系统 | 10 |
| 7 | WO2014001780A1 | Improvements to refrigeration systems | 10 |
| 8 | CN110940105A | 一种喷射器与涡流管组合的自复叠制冷系统 | 9 |
| 9 | WO2002101305A1 | Co2 hot gas defrosting of cascade refrigeration plants | 7 |
| 10 | CN104567071A | 一种二氧化碳与氟复叠制冷及融霜系统 | 6 |
Citation counts reflect influence within the searched corpus and skew toward older filings; a high count signals a foundational reference, not necessarily current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three patterns stand out once the raw counts are read against filing behaviour and citation history.
The cycle architecture rush already happened
Cascade and CO2 transcritical cycle claims saw their heaviest filing activity around 2019. The midpoint year sits below peak, which for a 69-family dataset this size means the core architecture space is not attracting fresh entrants at the earlier rate.
Filing has shifted toward Chinese receiving offices
China accounts for more tracked filings than the EPO, US and PCT combined against any single one of them. That concentration suggests domestic manufacturers and universities are now the more active filers on cycle-architecture and ejector claims.
Foundational cascade claims are decades old
The most-cited record in this set is a multicomponent cascade refrigeration patent for gas-mixture cooling, cited 67 times. Heavy reliance on a single old reference signals that base cascade architecture is settled prior art rather than contested ground.
No single assignee is currently pulling ahead
Every tracked assignee, from Honeywell to DuPont-linked entities to Tianjin University of Commerce, shows zero filings in the most recent tracked year. Momentum has flattened across the board rather than consolidating around a leader.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to commercial refrigeration systems, with the prior art for and against each one.
Who holds the claim space, and where it opens up
Filing here is split between refrigerant-chemistry incumbents, refrigeration-equipment specialists and Chinese university and compressor-manufacturer filers — with only a handful of co-filed families linking any of them together.
Legacy refrigerant makers still anchor collaborative filings
The strongest co-assignee pairing in the dataset links a DuPont entity to a Chemours-linked fluorochemical filer, with additional single-count pairings to named inventors. This reflects the historical split of fluorochemical refrigerant IP as those businesses separated corporate structures.
Modular ammonia cascade claims sit among the most-cited
Cascade refrigeration system claims built around modular ammonia chiller units rank among the highest-cited records in the set, alongside older cascade arrangement patents. This is evidence that cascade-cycle architecture for industrial-scale cooling was substantially claimed in the 2000s–2010s.
Universities and compressor makers are the active domestic filers
Chinese receiving-office activity is led by university and compressor-manufacturer filers rather than multinational refrigerant chemistry firms, pointing to domestic R&D concentrated on ejector-enhanced self-cascade cycles and compressor-integrated systems.
| Assignee | Recent year | YoY |
|---|---|---|
| Honeywell International Inc. | 0 | -100% |
| Tianjin University of Commerce | 0 | — |
| E.I. du Pont de Nemours and Company (DuPont, US) | 0 | — |
| York Refrigeration Technologies | 0 | — |
| STENHOUSE JAMES THORNTON | 0 | — |
| ARCTIKO | 0 | — |
| Sick Refrigeration Products LLC | 0 | — |
| Bingshan Songyang Compressor (Dalian) Co., Ltd. | 0 | — |
Where to take this next
The dataset points to a settled cascade architecture and a shifting filing centre of gravity toward China — the open questions are about subsystem claims and freedom to operate.
Map subsystem claims against your own design
Ejector, gas-cooler and defrost-strategy claims are thinner than core cycle-architecture claims. Run your specific subsystem design against the full family list before assuming a clear path.
Explore the full patent set in EurekaTrack Chinese filer activity directly
With China now the largest receiving office in this dataset, monitoring newly published Chinese-language families is necessary to catch activity before English-language abstracts appear.
Set up assignee monitoring in EurekaWatch for the 18-month reporting lag
The apparent flattening in 2025–2026 filings is partly a publication-lag artefact. Revisit the trend once the next data cut becomes available before drawing conclusions about a real slowdown.
Ask Eureka about recent filingsCommon questions about commercial refrigeration patents
The dataset shows a fragmented field rather than a single dominant filer. Refrigerant-chemistry firms including Honeywell and DuPont-linked entities, refrigeration-equipment specialists such as York Refrigeration Technologies, and Chinese filers including Tianjin University of Commerce and Xi'an Jiaotong University all appear, but every one of them shows zero filings in the most recent tracked year. That flat momentum across all named assignees means no single company currently holds a clear lead in fresh filing activity, which is different from holding a lead in cumulative granted claims.
CO2 transcritical refrigeration uses carbon dioxide as the working fluid in a cycle that operates above its critical point on the high-pressure side, avoiding higher-GWP synthetic refrigerants. It sits inside the F25B9 and F25B40 subclasses tracked in this landscape alongside cascade refrigeration, and much of the ejector and gas-cooler claim activity in this dataset is aimed at making transcritical CO2 systems more efficient. It matters for patent strategy because refrigerant-transition regulation is pushing manufacturers toward CO2 and ammonia cycles, increasing the value of efficiency-improving subsystem claims even where core cycle architecture is settled.
Filing peaked at 9 tracked families in 2019 and has not returned to that level, with the 2022 midpoint at 6. Part of this apparent decline is a real slowdown in new cycle-architecture filings once base cascade and transcritical claims were established. But part of it is a publication-lag artefact: patent applications typically publish around 18 months after filing, so the 2025 and 2026 figures in this dataset understate actual filing activity and should not be read as a confirmed downward trend yet.
Relative to the dense claim coverage on core cascade and transcritical cycle architecture, this dataset shows thinner activity in two-phase ejector self-cascade cycles, gas-cooler defrost coordination specifically for transcritical systems, leak detection sensor integration, and energy-consumption optimisation controls under G05B. These are subsystem and controls areas rather than cycle topology, which is consistent with a field where the base architecture is settled prior art and competitive differentiation is moving to efficiency and monitoring features.
China accounts for 24 of the tracked receiving-office filings, more than double the EPO's 11 and ahead of the US and PCT route at 8 each. This shift means that a freedom-to-operate analysis limited to US and European filings will miss a meaningful share of relevant claims, particularly around ejector-enhanced self-cascade cycles and compressor-integrated systems where Chinese universities and compressor manufacturers are active filers. Any FTO review for this space should include a direct CNIPA search rather than relying on PCT or EPO family equivalents alone.
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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.