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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/cabin-air-quality-and-filtration-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Cabin Air Quality & FiltrationCabin air quality and filtration patents: mapping the filing landscape
- Concentrated at the top. the five most active assignees hold 51.4% of all 280 records in scope, and the leading ten hold 65.7% — filing here is far from an open field.
- Filing has plateaued, not declined. annual filings held flat at 20 in both 2021 and 2024 (0% change), with 2022 the peak year so far at 29 — treat 2025-26 counts as still filling in given publication lag.
- Filtration dominates the claim space. B01D separation processes appear in 57.9% of the 280 records, more than double the next largest class, B60H vehicle HVAC at 20.4%.
280
Published Records
51%
Top-5 Share of All Records
0%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (20 records) with 2024 (20) — 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 280 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks patent filings at the intersection of cabin air filtration and the sensing and control systems that manage it — HEPA and multi-functional filter media, ozone converters, VOC and fume detection, air quality sensors, and recirculation/mixing-chamber control — across both automotive and aircraft cabins. The scope spans 280 published records filed between 2015 and mid-2026, drawn from a search string that pairs contamination and filtration terms with the sensing and conversion technologies used to manage them.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend understate real filing activity; 2024 is the last year that can be read as a complete picture.
Filing activity and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Cabin Air Quality and Filtration covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The data
Filing trend and technology composition
Two views of the same 280-record dataset: how filing volume has moved year over year, and how records distribute across the IPC subclasses that define the technical scope.
Filing trend, 2017-2026
Annual filings rose to a peak of 29 in 2022, then held flat at 20 in both 2021 and 2024 — a 0% three-year change. The tail into 2025-2026 reflects publication lag rather than a real slowdown.
Technology composition by IPC subclass
B01D separation processes anchor the field at 57.9% of the 280 records, with B60H vehicle heating/AC (20.4%) and B64D aircraft equipment (17.1%) forming the next tier. Because records can carry multiple IPC codes, these shares sum to more than 100%.
Shares are the percentage of the 280 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Cabin Air Quality and Filtration covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Most-cited records and a representative filing
Representative filing
Method for operating a vehicle cabin air filtration system (EP4230450A1, MANN+HUMMEL)
MANN+HUMMEL GMBH
The filing describes a cabin air filtration system that adjusts both the total air flow through the filter device and the recirculation ratio between fresh and recirculated cabin air, while allowing a portion of outside air to enter as unfiltered infiltration influx bypassing the filter. Control logic sits between the filter hardware and the cabin, adjusting flow magnitude and recirculation ratio dynamically rather than filtering at a fixed rate.Abstract condensed from the published filing for readability.
Highest-citation records in scope
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6395073B1 | Multi-functional filter for removing contaminants from an enclosure | 208 |
| 2 | US6296691B1 | Multi-functional molded filter for removing contaminants from an enclosure | 161 |
| 3 | US6238467B1 | Rigid multi-functional filter assembly | 148 |
| 4 | US20040031248A1 | Portable motor vehicle cabin air purifier | 117 |
| 5 | US20030209604A1 | Wearable computing system, method and device | 100 |
| 6 | US5754365A | Structure and enclosure assembly for a disk drive | 92 |
| 7 | US6773477B2 | Portable motor vehicle cabin air purifier | 90 |
| 8 | US7118608B2 | Self-powered, wearable personal air purifier | 89 |
| 9 | US6285524B1 | Structure and enclosure assembly for a disk drive | 87 |
| 10 | US20160214723A1 | Aircraft environmental control system that optimizes the proportion of outside air from engines, APU's, groun… | 75 |
Citation counts favour older filings that have had more time to accumulate citations within this corpus; treat them as a signal of influence, not of current technical importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Cabin Air Quality and Filtration covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three read-outs from the dataset that matter more for strategy than the raw counts alone.
Concentration
51.4% / 65.7%
share held by top 5 / top 10 of 280 records
The leading tier is entrenched, not just active
With the top five assignees holding 51.4% of all 280 records and the top ten holding 65.7%, new entrants are filing into a field where core filter-media and system-control claims are already staked out by a small group of incumbents.
Based on the full 77-company ranking returned for this scope.
Filing momentum
20 → 20 (0%)
annual filings, 2021 vs 2024
A plateau, not a retreat
Filing volume peaked at 29 in 2022 and returned to 20 by 2024, matching the 2021 level — flat momentum rather than decline. Counts for 2025-2026 will rise as publications catch up with filing dates.
2024 is the last year treated as complete given the ~18-month publication lag.
Technology mix
57.9% B01D
share of 280 records classed under separation processes
Filtration hardware still carries the claim load
B01D separation processes appear in well over half of records, more than the combined weight of vehicle HVAC (B60H, 20.4%) and aircraft equipment (B64D, 17.1%). Sensing-adjacent classes like G01N (7.9%) and G06F (4.3%) are present but thin by comparison.
Class shares sum above 100% because records can carry multiple IPC codes.
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Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Cabin Air Quality and Filtration covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gate sits
The ranked field runs to 77 companies, but the concentration figures show most of the activity sitting with a small leading group; the description below stays qualitative because the underlying ranking table renders the exact order.
Leader
35 records
leading assignee's count
A single filer sits well ahead of the field
The top-ranked assignee holds 35 records against 20 at fifth place and 7 at tenth — a steep drop-off that marks this as a leader-plus-long-tail structure rather than an evenly distributed field.
Counted in records across the 77-company ranking.
Mid-field
20 at #5, 7 at #10
records held by fifth- and tenth-ranked assignees
The mid-tier thins out quickly
By the tenth position, assignee counts have fallen to single digits, meaning most of the ranked 77 companies hold only a handful of records each — consistent with a long tail of occasional or single-filing entrants.
Figures as stated in the assignee ranking, not recomputed.
Collaboration
10 pairs
co-assignee pairs identified
Co-filing is limited and concentrated
Only ten co-assignee pairs appear in the dataset, and the strongest of them links one filter-media incumbent to a small number of named inventors rather than to other corporate assignees — cross-company joint filing is not yet a feature of this field.
Strongest pair recurs across multiple filings with the same named individual.
Recent-year momentum among leading assignees
| Assignee | Recent year | YoY |
|---|---|---|
| Gore Enterprise Holdings, Inc. | 0 | — |
| Hollingsworth & Vose Company | 0 | -100% |
| MANN+HUMMEL GmbH | 0 | — |
| Honeywell International Inc. | 0 | — |
| Pall Corp | 0 | — |
| LINDSAY MARIE DEHARPPORT | 0 | — |
| Daikin Industries, Ltd. | 0 | — |
| MANNHUMMEL VENTURES PTE LTD | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Cabin Air Quality and Filtration covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's next
Where to take this analysis
The trend and composition data point to a field with an entrenched top tier and thinner but active adjacent branches. Two directions follow from that.
Check freedom-to-operate against the leading tier
Before filing into filter-media or recirculation-control claims, screen against the top five assignees' portfolios directly — they hold more than half of all 280 records and are the most likely source of blocking prior art.
Run a freedom-to-operate search in EurekaTrack the sensing-adjacent branches
G01N material analysis and G06F digital processing classes remain thin relative to filtration hardware, suggesting sensor-fusion and control-software claims are less contested — worth monitoring as filing catches up through the publication lag.
Set up a monitoring alert in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Cabin Air Quality and Filtration covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on cabin air quality patents
The dataset ranks 77 companies by record count, with a single leader holding 35 records against 20 at fifth place and 7 at tenth. The top five assignees together account for 51.4% of all 280 records in scope, and the top ten account for 65.7%, so filing activity is concentrated in a small leading group rather than spread evenly. This concentration matters for freedom-to-operate work: a new filer's most likely blocking prior art sits with that leading group, not the long tail of single-filing entrants.
Annual filings peaked at 29 in 2022 and had returned to 20 by 2024, the same level as 2021 — a flat, 0% three-year change rather than clear growth or decline. Counts for 2025 and 2026 appear lower in the raw data, but publication typically lags filing by around 18 months, so those years are still filling in and should not be read as a slowdown. The safest read is a plateau at a filing level the field has sustained since at least 2021.
Filtration hardware dominates: B01D separation processes appear in 57.9% of the 280 records in scope, more than double the next largest class. Vehicle heating and air conditioning (B60H, 20.4%) and aircraft equipment (B64D, 17.1%) form a second tier, with sensing and data-processing classes such as G01N and G06F present but comparatively thin. Because a single record can carry multiple IPC codes, these shares sum to more than 100% and should be read as coverage, not a partition of the field.
EP4230450A1, filed by MANN+HUMMEL and published in 2023, covers a method for operating a vehicle cabin air filtration system that adjusts both the total air flow through the filter and the ratio of fresh to recirculated air, while allowing some outside air to enter as unfiltered infiltration bypassing the filter. The claim sits in the control-logic layer above the filter hardware itself, meaning it is most relevant to anyone building adjustable recirculation or flow-control software rather than to filter media design. Reviewing the full claim set in Eureka is the reliable way to check overlap before filing a similar control scheme.
The technology composition data shows sensing- and control-adjacent classes — material analysis (G01N, 7.9% of records) and digital data processing (G06F, 4.3%) — filed far less than core filtration hardware (B01D, 57.9%). Co-assignee data also shows only 10 identified pairs, indicating limited cross-company collaboration on integrated sensor-plus-filter systems. That combination points to VOC sensor fusion, ozone-converter/HVAC integration, and aircraft fume-detection logic as areas with real filing activity but no single entrenched leader yet.
Answers are grounded in the same dataset. Derived from a Patsnap search on Cabin Air Quality and Filtration covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.