Patents Assigned to Air Purification Products, International
  • Dual-dipole electrostatic air filter
    Patent number: 4902306
    Abstract: A filter assembly (10) for removing particulate matter from air forced therethrough comprises two pairs of oppositely charged woven electrostatic filtering material. Each pair of electrostatic filtering material comprises a positively charged and a negatively charged layer (22, 24, 28 and 30). An open cell foam layer (26) is disposed between the two pairs. Metal grids (20,32) enclose the filtering elements.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: February 20, 1990
    Assignee: Air Purification Products International, Inc.
    Inventors: Gilbert W. Burnett, Paul D. Jackson
  • Four-sided air filter
    Patent number: 4749390
    Abstract: A filtering unit (10) has four filter holders (20) arranged in a rectangle around a blower (36). Each filter holder holds up to two filter elements (11). The blower draws air through the filter elements (11) and outputs filtered air through a vent (40). Refillable filter frames (16) are provided to allow the user to change the filter material (18). In one embodiment, glass chips are used as the filter material (18).
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: June 7, 1988
    Assignee: Air Purification Products, International
    Inventors: Gilbert W. Burnett, Paul D. Jackson