Industrial Fans and Blowers Patents: Who Leads, Trends 2026
- Filing has already peaked. the annual count rose to 25 families in 2022 and has not exceeded that since, pointing to a flattening or declining filing curve rather than an emerging one.
- No single assignee is pulling ahead. recent-year momentum across the named leaders — including Mitsubishi Electric, Carrier and Nidec — shows zero new families in the latest tracked year, consistent with a market where claim space was staked out earlier.
- The core IPC class carries almost the whole dataset. F04D accounts for all 258 records while adjacent classes like turbines, engine cooling and vehicle HVAC each contribute single digits to low teens, showing where the claim density genuinely sits versus where it merely touches.
What the patent record shows about industrial fans and blowers
The dataset covers 258 patent families filed or published between 2015 and mid-2026 that combine industrial fan, centrifugal blower or axial fan terminology with claims touching static efficiency, noise generation, impeller design, variable speed control or surge behaviour, classified under F04D and its neighbouring pump and compressor subclasses. Filing activity built steadily through the late 2010s, peaked in 2022, and has not returned to that level since — a pattern more consistent with a maturing claim landscape than an expanding one. Publication lags filing by roughly eighteen months, so the apparent drop into 2025 and 2026 understates real filing activity in those years.
Receiving-office data shows the United States and China as the two largest jurisdictions by a wide margin, with Europe close behind and Japan, India and the WIPO PCT route each taking a smaller share. That spread suggests companies are filing where they manufacture and sell equipment rather than concentrating protection in a single home jurisdiction, which matters for freedom-to-operate checks before entering a new regional market.
Filing trend and technology composition
Two views of the same 258-family dataset: how filing activity has moved year over year, and how those families distribute across the IPC subclasses that touch fan and blower technology.
A flat-to-declining filing curve since the 2022 peak
Filings rose from 19 in 2017 to a peak of 25 in 2022, then eased off; the 2026 figure is a partial year and should not be read as a collapse.
F04D dominates; everything else is incidental overlap
All 258 records sit in F04D (non-positive-displacement pumps), with far smaller counts spilling into turbines (F01D), engine cooling (F01P), general ventilation (F24F), vehicle HVAC (B60H), batteries (H01M), marine propulsion (B63H) and valves (F16K) — evidence that fan- and blower-specific claims are the dataset's centre of gravity rather than a side effect of broader machinery filings.
Shares are the percentage of the 258 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Industrial Fans and Blowers with Eureka
This page is one run against one query. Ask Eureka your own question about industrial fans and blowers and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art carrying the most citation weight
US5501576A — Static efficiency enhancer for axial fans
A static efficiency enhancer for an axial fan having a hub and a plurality of blades extending radially outward from the hub, the enhancer comprising a plurality of airfoils connected to the hub and extending outwardly therefrom to provide additional air velocity at the periphery of the hub.Filed by Hudson Products Corporation and granted in 1996, this filing is a useful reference point for how narrowly early static-efficiency claims were drafted around a specific hub-mounted airfoil structure.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4692091A | Low noise fan | 141 |
| 2 | US5152661A | Method and apparatus for producing fluid pressure and controlling boundary layer | 123 |
| 3 | US5601400A | Centrifugal blower improved to reduce vibration and noise | 94 |
| 4 | US4540335A | Controllable-pitch moving blade type axial fan | 80 |
| 5 | US20030012649A1 | Centrifugal blower | 70 |
| 6 | US20020119044A1 | Centrifugal blower with partitioned scroll diffuser | 62 |
| 7 | US4927328A | Shroud assembly for axial flow fans | 44 |
| 8 | US7246997B2 | Integrated high efficiency blower apparatus for HVAC systems | 41 |
| 9 | JP2002070793A | Centrifugal blower | 41 |
| 10 | US2305136A | Centrifugal blower construction | 34 |
Citation counts inside a searched corpus favour older filings that have had more years to accumulate references — treat these as markers of influence on later filers, not as a ranking of current commercial relevance.
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 filing strategy
Reading the trend, the citation table and the IPC split together points to a technology area where the foundational claims are old, well cited, and narrow enough that later filers have kept working around them rather than replacing them.
The curve has already crested
Annual filings climbed from 19 in 2017 to a peak of 25 in 2022 and have not surpassed it since. Combined with the publication lag, this looks like a technology area where the easy claim territory has largely been staked out rather than one still accelerating.
Old noise and efficiency patents still anchor the field
The most-cited record, a low-noise fan patent, carries 141 citations, well ahead of the next entries in the table. Heavy citation of older grants signals that foundational noise-reduction and boundary-layer control approaches remain the reference point later filers design around.
Nearly all activity sits in one IPC subclass
Every record in the dataset touches F04D, with only small spillovers into turbines, engine cooling, vehicle HVAC and battery cooling. That concentration means differentiation inside F04D — not adjacent classes — is where competitive filing pressure actually lives.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to industrial fans and blowers, with the prior art for and against each one.
Assignee landscape: broad participation, no runaway leader
Recent-year momentum figures show every one of the more active named assignees — spanning Japanese electronics makers, US HVAC majors and specialist fan manufacturers — filing zero new families in the latest tracked year, a sign of a landscape with wide historical participation rather than one leader still pulling ahead.
No assignee is currently accelerating
Mitsubishi Electric, Carrier, Nidec, Bloom Energy and other named leaders all show zero filings in the most recent tracked year. Given the publication lag this likely understates true 2025-2026 activity, but it still points to a landscape without an obvious current front-runner.
Co-filing is rare and localized
Only four co-assignee pairings appear across the dataset, and the strongest repeated pairing is a single specialist manufacturer, Nuaire, filing jointly with named individual inventors. This is a field of largely independent corporate filers rather than joint-development consortia.
Filing follows manufacturing and sales geography
The United States and China lead as receiving offices, with Europe close behind and Japan, India and the WIPO PCT route taking smaller shares. Entrants should expect meaningful prior art in all three major offices, not just their home jurisdiction.
| Assignee | Recent year | YoY |
|---|---|---|
| Mitsubishi Electric Corporation | 0 | — |
| Carrier Corporation | 0 | — |
| NUAIRE | 0 | — |
| Nidec Corporation | 0 | — |
| Bloom Energy Corporation | 0 | — |
| Kefunke Co., Ltd. | 0 | — |
| Denso Corporation | 0 | — |
| Regal Rexnord (Regal Beloit) Corporation | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, white-space filing, or competitive tracking.
Check freedom-to-operate against the top-cited grants
Before finalising an impeller or noise-reduction design, run claim charts against the highest-cited records in this dataset, since these are the filings later applicants have most consistently designed around.
Explore prior art in EurekaModel the under-claimed branches
The thin overlaps into battery thermal management, marine propulsion and vehicle HVAC suggest claim scope is still open where fan technology meets those adjacent fields.
Map white space in EurekaTrack assignee filing activity going forward
With every leading assignee showing zero filings in the latest tracked year, set up ongoing monitoring to catch the moment activity resumes, since the publication lag means it may already be underway.
Set up monitoring in EurekaCommon questions about industrial fan and blower patents
The dataset shows broad participation rather than a single dominant holder: named leaders include Mitsubishi Electric, Carrier, Nidec, Bloom Energy and specialist manufacturer Nuaire, alongside a long tail of smaller Chinese manufacturers and individual inventors. None of these leading assignees show new filings in the most recent tracked year, which is partly an artefact of the roughly 18-month publication lag rather than a sign that they have stopped innovating. For a freedom-to-operate check, it is safer to search the full assignee list than to assume one company controls the field.
Filings rose from 19 families in 2017 to a peak of 25 in 2022, then eased off in the years since, giving a flat-to-declining curve rather than a growth curve. Because publication lags filing by around 18 months, the low counts shown for 2025 and 2026 understate real activity in those years. Read the trend as a maturing claim landscape rather than a shrinking market for the underlying equipment.
The core classification is F04D, covering non-positive-displacement pumps, which accounts for all 258 records in this dataset. Smaller numbers of records also touch F01D (turbines), F01P (engine cooling), F24F (air conditioning and ventilation), B60H (vehicle HVAC), H01M (batteries), B63H (marine propulsion) and F16K (valves), reflecting where fan and blower technology overlaps with adjacent equipment. Anyone drafting new claims in this space should search F04D exhaustively before assuming novelty.
US5501576A, assigned to Hudson Products Corporation, claims a static efficiency enhancer built from airfoils mounted on an axial fan hub to increase air velocity at the hub's periphery. It does not block axial fan designs generally; it blocks the specific combination of hub-mounted airfoil structures added for that stated purpose. Designers working on axial fan efficiency should review its claim language closely if their approach also modifies airflow near the hub rather than at the blade tip or shroud.
The thinnest overlaps in this dataset sit where fan and blower technology meets battery thermal management, marine propulsion and vehicle HVAC systems, each contributing only a handful of records against the 258 concentrated in the core F04D classification. Variable-speed control aimed specifically at surge suppression also appears underrepresented relative to the volume of general impeller and noise-generation claims. These branches are worth a closer prior-art search before assuming they are already crowded, since low record counts here likely reflect open claim space rather than lack of technical interest.
Research Industrial Fans and Blowers in depth with Eureka
Go past this page: query the whole industrial fans and blowers 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.