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Portable air purifier
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Patent number 10,799,729
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Issue date Oct 13, 2020
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Yeon-Ok Choi
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Centrifugal ceiling fan
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Patent number 10,677,250
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Issue date Jun 9, 2020
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SECTAR SOLUTIONS INC.
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Alessandro Seccareccia
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F24 - HEATING RANGES VENTILATING
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Filter/fan system
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Patent number 7,971,857
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Issue date Jul 5, 2011
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Gerald P. Mazza
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F24 - HEATING RANGES VENTILATING
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Purification unit
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Patent number 7,451,769
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Issue date Nov 18, 2008
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Herbert Wirth
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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Hygienic air handler
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Patent number 6,234,241
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Issue date May 22, 2001
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Robert L. Elmore
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Pollen filter
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Patent number 5,951,727
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Issue date Sep 14, 1999
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Beiersdorf AG
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Manfred Spies
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F24 - HEATING RANGES VENTILATING
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Non-entraining filter
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Patent number 5,863,312
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Issue date Jan 26, 1999
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Michael Wolfe
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F24 - HEATING RANGES VENTILATING
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Hygienic air handler
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Patent number 5,558,158
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Issue date Sep 24, 1996
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Robert L. Elmore
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Air filter assembly
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Patent number 5,492,551
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Issue date Feb 20, 1996
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Michael Wolfe
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F24 - HEATING RANGES VENTILATING
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Air filter assembly
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Patent number 5,312,467
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Issue date May 17, 1994
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Michael Wolfe
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F24 - HEATING RANGES VENTILATING