Industrial Air Filtration Patents: Top Companies & Trends 2026
- Filing has cooled since its 2017 peak. 23 families that year against 6 in the most recent (partial) year, with 2022 sitting at 13 — a flat-to-declining trend rather than a growing one.
- The dataset concentrates almost entirely in B01D. 288 of 290 records sit in separation processes, while adjacent branches like magnetic/electrostatic separation (B03C, 17) and vehicle HVAC (B60H, 10) are comparatively thin.
- The most-cited prior art predates the modern filing wave by decades. The top-cited record draws 346 citations from a 1990s filing, meaning today's applicants are still designing around foundational patents, not recent ones.
What this landscape covers
This dataset tracks patent families filed against a search built around industrial air filtration, HEPA filter and dust collection filter terminology, restricted to claim and description language covering filtration efficiency, pressure drop, pulse jet cleaning, media selection and particle loading. The IPC scope centres on B01D46, B01D39 and B01D50 — the core separation-process subclasses for gas filtration, filter media construction, and combined separator/heater apparatus.
290 published families span 2015 through mid-2026. Because publication typically lags filing by around eighteen months, the last one to two years in any trend chart will understate real filing activity — read the tail as a floor, not a ceiling.
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Filing trend and technology composition
The filing curve and the IPC breakdown together show a field that expanded quickly, peaked, and has since pulled back, while claim activity stays heavily concentrated in one subclass.
A single peak year, then a pullback
Filings ran to 23 families in 2017, the peak of the window, then eased toward a midpoint of 13 in 2022 and down to 6 in the most recent partial year. That pattern reads as a maturing, consolidating field rather than one still in a land-grab phase — later entrants are filing into denser prior art with fewer open claim positions.
B01D dominates; F24F and A61L trail as secondary branches
288 of 290 records classify under B01D (separation processes), confirming this is fundamentally a filtration-media and apparatus dataset. F24F (air conditioning & ventilation, 64) and A61L (sterilising & disinfecting, 32) appear as secondary overlays — filtration combined with HVAC integration or antimicrobial treatment — while B03C (magnetic/electrostatic separation, 17), G01M (testing, 14), B01J (catalysis, 11) and B60H (vehicle HVAC, 10) each represent narrower, thinly-filed adjacencies.
Shares are the percentage of the 290 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Industrial Air Filtration with Eureka
This page is one run against one query. Ask Eureka your own question about industrial air filtration and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
US20140260994A1 — Portable industrial air filtration device
Filed by Illinois Tool Works, this record covers a portable device using an annular dual-filter assembly — a removable self-supporting outer pre-filter surrounding a separately removable inner filter — housed in a two-piece locking enclosure. The design targets rapid deployment for localized air quality improvement rather than fixed industrial installations.Abstract trimmed for length; full claims available via the linked record.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5997619A | Air purification system | 346 |
| 2 | US5714126A | Respirator filter system | 304 |
| 3 | US5626820A | Clean room air filtering | 220 |
| 4 | US3807150A | Absolute filter pack structure having a toroidal section | 205 |
| 5 | US4687579A | Sintered composite medium and filter | 140 |
| 6 | US4824451A | Melt-blown filter medium | 138 |
| 7 | US6428610B1 | Hepa filter | 122 |
| 8 | US20040031248A1 | Portable motor vehicle cabin air purifier | 117 |
| 9 | US6409785B1 | Cleanable HEPA filter media | 104 |
| 10 | US5837040A | Room air decontamination device | 100 |
Citation counts reflect influence within the searched corpus and skew toward older filings; treat them as a signal of foundational relevance, not current market activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say about the field's maturity
Three signals — the filing curve, the IPC spread, and the citation ages — point the same direction: this is a settled field with a narrow core and thin, largely unclaimed edges.
Growth has stalled, not accelerated
With 2022 sitting at 13 families, the midpoint confirms a genuine decline rather than a data-cutoff artefact. New entrants should expect a mature prior-art landscape in the core B01D claims.
Nearly the entire corpus sits in one subclass
Separation-process claims dominate almost completely, meaning differentiation is unlikely to come from broad apparatus claims and more likely from media chemistry, cleaning-cycle control or sensor integration.
Foundational patents still anchor design-around analysis
The most-cited records in this set predate the 2015–2026 filing window by two decades or more. Freedom-to-operate work in this space still has to clear pre-2000 filter-structure patents, not just recent ones.
Filing is US-centred with meaningful India and EPO activity
India (28), EPO (27), WIPO/PCT (27), Australia (25) and China (21) each carry a meaningful share, suggesting multi-jurisdiction filing strategies are common among the more active assignees rather than single-market protection.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to industrial air filtration, with the prior art for and against each one.
Who holds the ground, and where it opens up
Recent-year momentum across the tracked assignees has flattened to zero in the latest year across the board, consistent with the broader filing pullback — this is a field where existing portfolios are being maintained more than expanded.
Established filers have gone quiet
None of the most active assignees in this dataset show filings in the most recent year, which given publication lag may partly reflect pending applications not yet public — but it also fits a field past its filing peak.
Co-filing is rare and mostly single-instance
Only seven co-assignee pairs appear across 290 families, most with a single shared filing. Joint development in this space is the exception, not the norm — most portfolios are built by one assignee working alone.
Protection strategies span multiple jurisdictions
The presence of India, EPO, WIPO/PCT, Australia and China alongside the US suggests the leading assignees treat this as a globally relevant filtration category, not a US-only compliance play.
| Assignee | Recent year | YoY |
|---|---|---|
| Illinois Tool Works Inc. | 0 | — |
| Hollingsworth & Vose Company | 0 | — |
| AAF-McQuay Inc. | 0 | — |
| Ridder Corporation | 0 | — |
| Donaldson Company, Inc. | 0 | — |
| Emerson Network Power Systems North America, Inc. | 0 | — |
| LINDSAY MARIE DEHARPPORT | 0 | — |
| AIRVAC LIMITED | 0 | — |
Where to take this analysis
The trend and ownership data point to specific next steps depending on whether the goal is freedom-to-operate, licensing, or new filing strategy.
Run a design-around check against the top-cited records
The heaviest-cited patents in this set are decades old and still likely to be cited in examination. A claim chart against those specific structures is more useful than a general novelty search.
Explore prior art in EurekaMap the under-claimed branches to your own roadmap
Magnetic pre-separation, sensor-driven pulse-jet timing and sterilisation-integrated cartridges all show thin filing density relative to the B01D core — each is a plausible first-claim target.
Model white space in EurekaCommon questions on industrial air filtration patents
The dataset's assignee ranking is dominated by established filtration equipment manufacturers with long-running portfolios rather than recent entrants. Their recent-year filing activity has dropped to zero across the board, which is consistent with a field past its 2017 filing peak. Anyone evaluating a leader should check both total family count and how recently that count was built, since a large historical portfolio does not necessarily mean active current filing.
Filing activity peaked in 2017 at 23 families and has declined since, sitting at 13 at the 2022 midpoint and 6 in the latest partial year. Because publication lags filing by roughly eighteen months, the most recent year understates true activity, but the multi-year trend from peak to midpoint is a genuine decline, not a data artefact. New filers should expect denser prior art in the core claim areas than the raw yearly counts might suggest at first glance.
B01D — covering separation processes including gas filtration and filter media — accounts for 288 of the 290 records in this dataset, making it the dominant classification by a wide margin. F24F (air conditioning and ventilation) and A61L (sterilising and disinfecting) appear as secondary overlays where filtration intersects with HVAC systems or antimicrobial treatment. Searches or freedom-to-operate work limited to B01D alone will miss these cross-classified filings.
This Illinois Tool Works filing covers a portable industrial air filtration device built around an annular dual-filter assembly: a removable, self-supporting outer pre-filter surrounding a separately removable inner filter, housed in a two-piece locking enclosure. The claims are specific to that dual-filter, quick-release housing architecture rather than to filtration media chemistry or pulse-jet cleaning methods broadly. Products using single-stage filters, fixed (non-removable) media, or non-annular filter geometries are less likely to fall within its specific claim scope, though a full claim chart is needed to confirm this for any particular design.
The IPC composition shows heavy concentration in core B01D separation-process claims but comparatively thin filing in adjacent branches: magnetic and electrostatic separation (B03C, 17 records), vehicle cabin HVAC integration (B60H, 10 records), and testing/monitoring apparatus (G01M, 14 records). These thinner branches suggest room for claims that combine mechanical filtration with sensing, magnetic pre-separation, or vehicle-specific integration, areas that have not attracted the same filing density as the general filter-media and housing claims.
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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.