Patent ID: 7785404

Claim:
An air purifier, comprising: a housing having apertures for admitting and expelling air flowing through the housing; a first electrode assembly in the housing, the first electrode assembly comprising a first wire electrode and no more than one first wire electrode; a second electrode assembly in the housing, the second electrode assembly comprising a plurality of second blade electrodes, each second blade electrode disposed substantially parallel to the first wire electrode, wherein each second blade electrode has blunt leading and trailing edges, and at least one of the leading and trailing edge of each blade second electrode has a radius of curvature greater than about 1 mm, and wherein no portion of the plurality of second blade electrodes are disposed closer than about 30 mm from any portion of the first wire electrode; and a high voltage power supply for providing an electrical potential between the first electrode and each of the second electrodes of 23-50 kilovolts (kV), the power supply having a feedback circuit for responding to changes in electrode current by controlling electrode voltage.