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Patent landscapes › Home & cleaning

Is a air purifier patented?

Short answer: specific designs of a air purifier have been patented many times, but "a air purifier" as a general idea is not what is protected. What matters is the exact combination of features in your version.

What our index shows
  • 3,320 US and WO patent publications since 2000 have a title matching “air purif” or a close variant (our index of 9.7 million patent families; one publication per family).
  • Among the 1285 best keyword matches we examined, 753 were published in 2020 or later, and the earliest was published in 2000.
  • Most frequent assignees in those matches: LG ELECTRONICS INC (90), SAMSUNG ELECTRONICS CO LTD (63), DYSON TECHNOLOGY LTD (60), COWAY CO LTD (37).
  • Most common patent classes (CPC subclasses): F24F (798), B01D (625), A61L (341), Y02A (164).

Counts come from keyword matching on titles and abstracts, so they are indicative, not a legal count. Some matches are different products that share a word.

14 real patent publications related to a air purifier

  1. Low pressure drop filter for air purifier WO-2026105922-A1 2026 · EQ AIR LAB INC
    The present invention relates to a low pressure drop filter for an air purifier and, more particularly, to a low pressure drop filter for an air purifier that separates and collects large particles of a predetermined size or large…
    View on Google Patents
  2. Outdoor air purifier including at least one filter element US-12576355-B2 2026 · MANN & HUMMEL GMBH
    An outdoor air purifier includes a housing including at least one housing cover part, a mounting base, at least one flow inlet for outdoor air to be purified, at least one flow outlet for cleaned air, and an inner clean air space,…
    View on Google Patents
  3. Filter assembly and air purifier including same US-2025257887-A1 2025 · COWAY CO LTD
    An air purifier include: a frame; a filter assembly detachably mounted in the frame for filtering air; a fan assembly providing a blowing force to move air from an outside of the frame to an inside of the frame; and a controller f…
    View on Google Patents
  4. Internal air purifier with controlled external air inlet, ultraviolet irradiation of the hepa filter and air diffuser with planned stratified flow WO-2022178603-A1 2022 · MK VENTILACAO E FILTRAGEM LTDA
    The present invention comprises an external air inlet (18), said air entering the device via a damper (9) and mixing with the recirculated internal air to satisfy renewal requirements, said air flow passing through four filtering …
    View on Google Patents
  5. Filtering device for air purifier WO-2022120804-A1 2022 · WANG WEIGANG
    A filtering device for an air purifier, comprising a filtering cavity (2) and a fan (7). An air outlet (12) is provided on the left side of the filtering cavity (2); a water tank (13) is arranged at the lower part of the filtering…
    View on Google Patents
  6. Air purifier and filter assembly thereof US-2022226762-A1 2022 · CHEN YUNG JEN
    An air purifier is disclosed and includes a housing, a cover, a filter assembly, and a fan. The housing includes a casing and a shell which are detachable from each other, the casing has a venting portion. The cover has at least o…
    View on Google Patents
  7. Air purifier having function of filtering out viruses and bacteria in air WO-2021221366-A1 2021 · SEO JUNG SOO
    Provided is an air purifier comprising: a high-temperature extension part which includes a high-temperature heater means and is provided on a part of a body having a certain size or volume and having an empty inner part or an acco…
    View on Google Patents
  8. Air purifier with bladeless air fan WO-2020242281-A1 2020 · SAZDOV DRAGANCHO
    Air purifier with bladeless air fan consisting of a housing, that houses a fan assembled from the front (1.2), air treatment filters (1.3), (1.4), rear (1.14), side cover (1.11), motor drive (1.16) placed in its own housing (1.17,…
    View on Google Patents
  9. Method for cleaning filter screen of air purifier WO-2020187223-A1 2020 · QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD
    A method for cleaning a filter screen of an air purifier comprising a fan and a a dust suction device. The fan draws external air into the air purifier when rotating forwards and blows air to a filter screen when rotating backward…
    View on Google Patents
  10. Air purifier with hepa screen WO-2018165791-A1 2018 · SHENZHEN SHANGYU TECH CO LTD
    Disclosed is an air purifier with an HEPA screen. The air purifier comprises a purifying tank (8) and a humidifying tank (18). A base (9) is mounted at the bottom of the purifying tank (8). A suction fan (1) is mounted at the top …
    View on Google Patents
  11. Air purifier for electric fan WO-2018097689-A1 2018 · LEE JANG WON
    In the present invention, an air purifier storing a filter paper is disposed in the rear portion of an electric fan to purify air or wind generated by the electric fan. Thus, there is an effect in which the role of an air purifier…
    View on Google Patents
  12. Method and apparatus for integrating effective use time of filtering net in air purifier WO-2014075348-A1 2014 · CTK TECHNOLOGY SHENZHEN CO LTD
    A method and an apparatus for integrating an effective use time of a filtering net in an air purifier, wherein the method for integrating the effective use time of the filtering net in the air purifier comprises: S1, determining a…
    View on Google Patents
  13. Photocatalytic air purifier for a fan coil unit US-7951327-B2 2011 · CARRIER CORP
    A photocatalytic air purifier is disclosed. The photocatalytic purifier includes filter structures coated with a catalytic material such as titanium dioxide. One or more UV lamps are interposed between the filter structures. The c…
    View on Google Patents
  14. Fan and conforming filter for a compact air purifier WO-2008034055-A1 2008 · DIAL CORP
    Systems and methods in accordance with various embodiments of the present invention generally provide a rotatable compact air purifier comprising an air flow module and a conforming filter assembly. The air flow module comprises a…
    View on Google Patents

What this means for your idea

Because patents cover specific combinations of features, the useful question is not “has a air purifier been patented?” but “has my combination of features been described before?” Household products tend to differ in the mechanism (how something attaches, folds, dispenses or cleans) rather than the basic idea.

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First-look landscape. Not exhaustive. Not legal advice. This page lists keyword-matched publications from a limited database; it does not say whether any product is or isn't covered by a patent, whether a patent is still in force, or whether your idea is patentable. Consult a registered patent attorney or agent.