Cabin & HVAC Air Filtration Patents: Leaders, Trends & White Space 2026
- Flat filing activity. the trend has been roughly flat to declining since a 2022 midpoint of just one filing, with a peak of five in 2024 — this is not a fast-growing field.
- One tightly linked cluster. the strongest co-assignee pairs all involve the same three names, each appearing together ten times, pointing to a single dominant filing group rather than broad industry participation.
- Cross-subclass spread. records cluster in B01D separation and B60H vehicle HVAC, but a meaningful slice touches F02M fuel supply and F24F ventilation — signalling adjacent-use claims worth checking before filing.
What this landscape covers
This review tracks patent families filed against cabin air filters, HVAC air filter media, and indoor air filtration where claims touch PM2.5 efficiency, VOC adsorption, pressure drop, antimicrobial media, or service interval language, under IPC classes B01D39, B01D46, and B60H3. The dataset spans 2015 through mid-2026 and contains 39 published records, each treated as its own family for ranking purposes.
Coverage is deliberately narrow: it excludes general HEPA filtration outside the cabin/HVAC context and general automotive HVAC hardware claims that do not reference filtration performance. Readers should treat the most recent one to two years as undercounted, since publication typically lags filing by around 18 months.
Filing trend and technology composition
The filing curve and IPC spread together describe a small, mature niche rather than an expanding one — most activity sits in two subclasses, with thin but real spillover into fuel supply and ventilation equipment.
A flat curve with one recent peak
Filings sat at zero in 2017, climbed unevenly to a midpoint of one family in 2022, and reached a peak of five in 2024 before the most recent year's count trails off — expected given publication lag, but the multi-year plateau before 2024 suggests this is a niche with episodic rather than sustained investment.
Two dominant subclasses, several adjacent ones
B01D (separation processes) and B60H (vehicle heating and air conditioning) account for the bulk of records, consistent with the search scope. F02M (fuel supply) appears in a notable share of records, likely reflecting shared filter-media claims across fuel and cabin air systems, while F24F (general ventilation), B03C (electrostatic separation), and G01N (testing) each appear in a handful of records — these smaller pockets are where cross-domain filing opportunities tend to hide.
Shares are the percentage of the 39 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Filtration Media for Cabin and HVAC Air Quality with Eureka
This page is one run against one query. Ask Eureka your own question about filtration media for cabin and hvac air quality and every answer comes back with the patent numbers behind it.
Try EurekaThe patents shaping this space
US9701178B2 — Cabin air filter
Filed by K&N Engineering, this patent describes a cabin air filter with a supportive frame sized for a vehicle's ventilation system and a filter medium that electrostatically attracts and agglomerates airborne molecular contaminants and volatile organic compounds, rather than relying on mechanical straining alone.Granted 2017-07-11.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6152996A | Air cleaner element having incorporated sorption element | 145 |
| 2 | US20160280046A1 | Cabin Air Filter | 22 |
| 3 | US9701178B2 | Cabin air filter | 21 |
| 4 | US20170356835A1 | Calculation-based vehicle cabin filtration performance | 17 |
| 5 | US20200215915A1 | Cabin air filter element monitoring and analysis system and associated methods | 13 |
| 6 | US10828986B2 | Cabin air filter element monitoring and analysis system and associated methods | 6 |
| 7 | CN109331553A | 纳米纤维素抗菌防雾霾窗纱的制备方法及其产品 | 5 |
| 8 | US10190957B2 | Calculation-based vehicle cabin filtration performance | 5 |
| 9 | US20230415081A1 | Articles comprising filter media with irregular structure and/or reversibly stretchable layers | 3 |
| 10 | WO1998039081A1 | Air cleaner element having incorporated sorption element | 3 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are not a measure 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.
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Three patterns matter more than any single ranking: the concentration of citations in one very old, heavily cited patent; the tight co-filing cluster; and the cross-subclass spillover that hints at underused claim angles.
One foundational patent dominates citation counts
US6152996A, describing an air cleaner element with an incorporated sorption element, is cited far more than any other record in this set (145 vs. the next-highest at 22). That gap signals a foundational claim on combined mechanical-and-sorption filtration that later filings have had to design around rather than ignore.
A single group files together repeatedly
The three strongest co-assignee pairings all share the same three names, each pair co-occurring ten times. That is unusually tight clustering for a 39-family dataset and points to one filing group — likely a company and named inventors — driving a disproportionate share of the documented activity.
Vehicle HVAC dominates, but fuel-system overlap is real
Beyond the core B01D/B60H pairing, sixteen records also carry an F02M fuel-supply classification. That overlap suggests filter-media claims are being written broadly enough to cover both cabin air and fuel filtration contexts — a detail worth checking before assuming a cabin-only claim is clear.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to filtration media for cabin and hvac air quality, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| K&N Engineering, Inc. | WALL JERE JAMES | 10 |
| K&N Engineering, Inc. | ROSENBAUM AMIR | 10 |
| WALL JERE JAMES | ROSENBAUM AMIR | 10 |
| K&N Engineering, Inc. | WILLIAMS STEVE | 8 |
| WALL JERE JAMES | WILLIAMS STEVE | 8 |
| ROSENBAUM AMIR | WILLIAMS STEVE | 8 |
| K&N Engineering, Inc. | WILIAMS STEVE | 2 |
| K&N Engineering, Inc. | STEVE WILIAMS | 2 |
The recurring three-way co-assignee cluster is the single relationship pattern in this dataset strong enough to name; no other pairing approaches the same repeat count.
Who is filing, and where the gaps sit
Recent-year momentum is flat across every tracked assignee, which is consistent with the overall filing plateau rather than any single company pulling back. The opening is less about outfiling an incumbent and more about claiming sub-areas nobody has staked out yet.
No assignee shows recent-year momentum
Every named assignee in the momentum data, including the core co-filing cluster, shows zero filings in the most recent tracked year. Given publication lag, this likely understates true recent activity rather than indicating the field has gone cold.
US-centric with meaningful PCT and EPO presence
The United States receives the largest single share of filings, with Australia, the EPO, the Philippines, WIPO/PCT, and the UK each contributing a smaller but non-trivial slice. That spread suggests filers are pursuing multi-jurisdiction protection rather than treating this as a US-only niche.
Older sorption-media claims still anchor the field
The most-cited record in this dataset predates the filing window and describes a combined mechanical-and-sorption air cleaner element. Newer filings addressing VOC adsorption or antimicrobial media should be checked against this claim before assuming a clear path.
| Assignee | Recent year | YoY |
|---|---|---|
| K&N Engineering, Inc. | 0 | — |
| WALL JERE JAMES | 0 | — |
| ROSENBAUM AMIR | 0 | — |
| WILLIAMS STEVE | 0 | — |
| Amerace Corporation | 0 | — |
| MANN+HUMMEL GmbH | 0 | — |
| Hollingsworth & Vose Company | 0 | — |
| HENGST SE | 0 | — |
Where to take this analysis
This landscape flags the structural pattern — a flat filing curve, one tight co-filing cluster, and thin coverage in several adjacent subclasses. Turning that into a filing or freedom-to-operate decision requires digging into the specific claims.
Check claim scope against US6152996A
Any new filing touching combined mechanical-and-sorption filtration should be checked against this heavily cited foundational patent before drafting.
Explore claims in Eureka →Map the co-filing cluster's full portfolio
The three-way co-assignee group appearing ten times each is worth a dedicated portfolio pull to see exactly what claim territory it holds.
Run a portfolio search in Eureka →Test the under-claimed sub-areas
Antimicrobial media durability and service-interval sensing show thin coverage in this dataset — worth a deeper novelty check before committing R&D.
Search white space in Eureka →Common questions about this landscape
This dataset contains 39 published patent families filed between 2015 and mid-2026 that match cabin air filter, HVAC air filter media, or indoor air filtration claims under IPC classes B01D39, B01D46, and B60H3. That is a small, specialised niche compared to broader automotive or HVAC filing volumes. The true recent-year count is likely higher than shown, since publication typically lags filing by around 18 months, so 2025 and 2026 figures will keep rising as more applications publish.
The data shows one tightly linked co-filing cluster of three names that repeatedly appear together, each pairing co-occurring ten times, which is unusually concentrated for a 39-family dataset. No assignee in the tracked group shows filings in the most recent year, though that is consistent with publication lag rather than a sign the group has stopped filing. Anyone assessing competitive position here should pull the full portfolio behind that cluster rather than relying on year-by-year counts alone.
US9701178B2, granted to K&N Engineering in 2017, claims a cabin air filter built around a supportive frame sized for a vehicle's ventilation system, holding a filter medium that electrostatically attracts and agglomerates airborne molecular contaminants and volatile organic compounds. The distinguishing element is the electrostatic-attraction mechanism combined with the frame's fit-for-purpose sizing, rather than simple mechanical straining. Anyone designing a cabin filter with electrostatic VOC capture should review this claim's scope before finalising a product design.
Based on IPC coverage, antimicrobial media durability, service-interval sensing integration, and VOC-specific adsorption media for general HVAC (as opposed to vehicle cabin) applications all show thin representation in this dataset. Electrostatic media regeneration methods and combined fuel/cabin filter media claims also appear underclaimed relative to the core B01D/B60H filing density. These are reasonable areas to investigate for freedom to operate, though a thin dataset count is not proof of an open field — it may also reflect low commercial interest.
The trend is flat to declining rather than growing: filings were at zero in 2017, sat around one family at the 2022 midpoint, and peaked at five in 2024. That pattern points to episodic rather than sustained investment in cabin and HVAC filtration media as a distinct claim category. Readers should still discount the very latest year, since publication lag means recent filings have not all surfaced yet.
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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.