Vapor-Injection Heat Pump Patents: Who Leads, Where the Gaps Are 2026
- Concentrated at the top. The five most active filers hold 45.1% of all 226 records in scope, and the top ten hold 65.5% — a narrow group controls the core claim space.
- Filing has cooled from its peak. After peaking at 26 filings in 2023, the 2021→2024 span shows a -20% change, though 2025-2026 figures are still filling in under normal publication lag.
- Vehicle HVAC is the second-largest branch. B60H vehicle heating and air-conditioning appears on 27.0% of records, second only to F25B refrigeration and heat pumps at 77.0% — automotive-grade vapor injection is not a niche.
Filing growth compares 2021 (20 records) with 2024 (16) — 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 226 records in scope (CR5), not by the ranked leaders only.
What this dataset covers
This landscape tracks 226 published records matching vapor-injection cycle, injection heat pump, economized heat pump and flash injection compressor language, cross-referenced against heat pump, vapor compression and refrigerant circuit terms. The scope runs from 2015 through the 2026-07-31 data cut-off, so the most recent filing years are necessarily incomplete because publication typically lags filing by around 18 months.
Filings cluster heavily in refrigeration and heat pump machinery, with a substantial secondary presence in vehicle climate control — a pairing that reflects how vapor-injection compressors moved from stationary heat pump equipment into electric-vehicle cabin heating, where compressor economizing recovers range lost to heating loads.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trends and technology composition
Two views of the same 226 records: how filing activity has moved year over year, and how it splits across the IPC subclasses a vapor-injection claim is likely to touch.
Filing trend, 2017-2026
Activity rose from 11 filings in 2017 to a peak of 26 in 2023, then eased — the 2021-to-2024 window shows a -20% change from 20 to 16 filings. Treat 2025 and 2026 as undercounts still catching up to the publication lag rather than evidence of a slowdown.
Technology composition by IPC subclass
F25B (refrigeration and heat pumps) touches 77.0% of the 226 records and B60H (vehicle heating and A/C) touches 27.0% — the two anchor classes. Smaller shares in F24F, F24H, F22B, F26B, C09K and F01D show where injection-cycle claims spill into adjacent equipment types; because records can carry multiple classes, these shares sum to more than 100%.
Shares are the percentage of the 226 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Heat Pumps — Vapor-Injection Heat Pumps Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about heat pumps — vapor-injection heat pumps patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited prior art in this space
EP3705323B1 — Heat pump air-conditioning system with improved vapor injection, for electric vehicles
Filed by NIO (Anhui) Holding and published 2023-01-11, this record sits squarely in the automotive vapor-injection branch that now accounts for over a quarter of the dataset. It illustrates how EV makers are drafting injection-cycle claims specifically around cabin heating and range recovery, rather than adapting stationary heat pump language after the fact.Abstract and filing details are drawn directly from the published record.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100005831A1 | Enhanced refrigerant system | 47 |
| 2 | US20060010899A1 | Flash tank for heat pump in heating and cooling modes of operation | 43 |
| 3 | US6817205B1 | Dual reversing valves for economized heat pump | 39 |
| 4 | JP2002120546A | Air conditioner for vehicle | 35 |
| 5 | CN105020924A | 一种空气源喷气增焓热泵系统 | 28 |
| 6 | US10737552B2 | Vapor injection heat pump and control method | 25 |
| 7 | US7137270B2 | Flash tank for heat pump in heating and cooling modes of operation | 24 |
| 8 | US20200039323A1 | Vapor injection heat pump and control method | 23 |
| 9 | US20200290429A1 | Vehicle vapor-injection heat pump system with controllable evaporator valve | 22 |
| 10 | US10465952B2 | Vapor injection heat pump and control method | 21 |
Citation counts inside this corpus favour older filings that have had more time to accumulate references — read them as a signal of influence on later drafting, not as a ranking of 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.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the numbers mean for a filer
Three figures worth acting on before drafting a new claim in this space.
The core claim space is narrow
With the five leading assignees holding 45.1% of all 226 records and the top ten holding 65.5%, the fundamental vapor-injection cycle and flash-tank architectures are largely staked out. New entrants are more likely to find room in application-specific integration than in the base cycle.
Growth has plateaued, not collapsed
The peak year so far is 2023 at 26 filings; the 2021-2024 window shows a measured pullback rather than a cliff. Because 2025-2026 records are still arriving under normal publication lag, any read of the last two years understates true filing activity.
Automotive is the clearest growth branch
F25B refrigeration and heat pump claims dominate at 77.0% of records, but B60H vehicle heating and air-conditioning at 27.0% is a distinct, sizeable second branch — evidence that vapor-injection compressors are being claimed deliberately for EV cabin heating, not just adapted from stationary designs.
China and the US anchor filing activity
China leads receiving-office counts at 104, with the United States at 57 and Europe, South Korea, WIPO and Germany trailing behind. A filer weighing where to seek protection should note this split runs well ahead of the smaller European and Korean offices.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to heat pumps — vapor-injection heat pumps patent landscape, with the prior art for and against each one.
Who is filing, and where the gate sits
The ranking covers 87 companies across the 226 records in scope — not a top-50 or top-100 cut, but the complete set the dataset returns. A handful of automotive and appliance names hold the largest blocks, with a long tail of single- or few-filing entrants behind them.
A single filer sets the pace
The top-ranked assignee holds 28 records, well ahead of the fifth-place filer at 13 and the tenth-place filer at 8 — a steep drop-off that marks where the leading cluster ends and the long tail begins.
Automotive groups file jointly
The strongest co-assignee pair in this dataset links two major Korean automakers at 11 shared records, with a Chinese university-industry pair close behind at 8 — a pattern consistent with in-house engineering teams filing alongside affiliated research units.
Even leaders show a pullback in the latest year
Several of the most active historical filers show sharp year-on-year declines in the latest year, including one leader down 82% and multiple others recording zero latest-year filings. This is consistent with the general publication lag rather than a genuine exit from the field, but it is worth confirming before assuming continued activity.
| Assignee | Recent year | YoY |
|---|---|---|
| Li Huayu | 2 | -82% |
| Ford Global Technologies, LLC | 0 | -100% |
| Gree Electric Appliances, Inc. of Zhuhai | 0 | -100% |
| Hanon Systems Co., Ltd. | 0 | — |
| Carrier Corporation | 0 | — |
| Kia Corporation | 0 | — |
| Hyundai Motor Co., Ltd. | 0 | — |
| Ningbo Haizhipu Intelligent Technology Co., Ltd. | 0 | -100% |
Where to take this analysis
The dataset points to a few concrete next steps for teams deciding whether to file, license, or design around.
Map the leader's full claim scope
With one assignee holding 28 records against a fifth-place figure of 13, understanding exactly what that leader has claimed — and where the claims narrow — is the first filter for any new filing decision.
Explore assignee claim scope in EurekaWatch the automotive branch specifically
B60H records at 27.0% of the dataset are growing in a different direction than the stationary F25B core; EV cabin-heating claims are worth tracking separately from general heat pump prior art.
Track automotive HVAC filings in EurekaRevisit white space before drafting
Smaller classes like F26B, C09K and F22B carry low record counts relative to F25B and B60H, suggesting specific integration claims in those areas face less prior art density.
Search white space by IPC class in EurekaCommon questions about this landscape
It is concentrated but not monopolised. The five leading assignees together hold 45.1% of the 226 records in scope, and the top ten hold 65.5%. That leaves roughly a third of the field spread across a long tail of 87 ranked companies, many with only a handful of filings each, so there is still room for a new filer to establish a position outside the core cycle claims.
The complete-year data shows a moderate pullback, not a collapse: filings went from 20 in 2021 to 16 in 2024, a -20% change, after peaking at 26 in 2023. The 2025 and 2026 figures in the dataset are understated because publication typically lags filing by about 18 months, so those years should not be read as a genuine drop-off until more data arrives.
Vehicle heating and air-conditioning is the clearest secondary driver, appearing in 27.0% of the 226 records via the B60H classification, second only to the 77.0% carried by F25B refrigeration and heat pump machinery. This reflects electric vehicle makers claiming vapor-injection compressor cycles specifically for cabin heating and range recovery, alongside smaller shares in water heating, drying, and boiler-adjacent equipment.
EP3705323B1 is a heat pump air-conditioning system with improved vapor injection, filed by NIO (Anhui) Holding and published on 2023-01-11, aimed at electric vehicle cabin heating. It is a useful representative filing because it shows how automotive OEMs are drafting vapor-injection claims as vehicle-specific systems rather than adapting stationary heat pump patents, which matters for anyone assessing freedom to operate in EV thermal management.
The smaller IPC classes in this dataset — F26B drying, C09K refrigerant materials, F22B steam and boiler systems, and F01D turbine-assisted expansion — each carry single-digit percentage shares of the 226 records, well below the 77.0% and 27.0% held by the two dominant classes. That gap suggests integration-specific claims in those adjacent equipment types face materially less prior art density than the core refrigeration and vehicle HVAC cycle claims.
Research Heat Pumps — Vapor-Injection Heat Pumps Patent Landscape in depth with Eureka
Go past this page: query the whole heat pumps — vapor-injection heat pumps patent landscape corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.