# US 7,465,338 B2 · Electrostatic air-purifying window screen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,465,338 B2 - Document ID: US7465338B2 - Status: Granted - Kind: B2 - Application number: 11/458,677 - Filed: 2006-07-19 - Published: 2007-02-15 - Granted: 2008-12-16 - Earliest claimed: 2005-07-28 - Inventors: Christian F. Kurasek - Web page: https://patentgrep.com/patent/US7465338B2 ## CPC - B03C 3/09: characterised by presence of stationary flat electrodes arranged with their flat surfaces at right angles to the gas stream - B03C 3/68: Control systems therefor {(electricity supply or control systems for cleaning the electrodes B03C3/746, B03C3/763)} - B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B) ## Abstract A window screen apparatus employing electrostatic principles to purify air. The window screen mesh wires encompass electrically-conductive filaments that are charged by a high-voltage DC pulse generator. Between and surrounding the wires an electric field is created that charges, traps, and repels airborne particulate. An alternative embodiment consists of a window screen in which the screen mesh wires are manufactured from permanently electrostatically charged fibers. ## Claims ### Claim 1 A window screen apparatus that utilizes electrostatic properties to purify the air passing through or in the vicinity of the apparatus comprising: a. a window screen frame designed to fit and latch into the window frame for which the apparatus is designed to be mounted; and b. a pair of electrically-conductive tracks that run the perimeter of the apparatus frame and are electrically insulated from each other and the apparatus frame, with one track being designated the negative potential track and the other track being designated the positive potential track; and c. a wire mesh screen, consisting of interwoven or cross-hatched wires, mounted to the window screen frame; and d. a power supply unit electrically connected to the tracks that generates high-voltage, low-amperage DC electric pulses; and e. a cleaning mechanism mounted to the window screen frame that cleans the wire mesh screen. ### Claim 2 (depends on 1) The apparatus of claim 1 wherein the wire used to create the screen mesh is made from a strong, flexible, and electrically-insulating material and is coated with a non-stick material and wholly contains within it one electrically conductive filament. ### Claim 3 (depends on 2) The apparatus of claim 2 wherein the filament contained within each screen mesh wire is electrically connected to one of the electrically-conductive tracks running the perimeter of the window screen frame. ### Claim 4 (depends on 3) The apparatus of claim 3 wherein the power supply unit consists of an AC-DC electric converter, a ground fault interrupter, a programmable logic control circuit, and a high-voltage DC pulse generator, connected in series. ### Claim 5 (depends on 3) The apparatus of claim 3 wherein the power supply unit consists of a battery harness, a programmable logic control circuit, and a high-voltage DC pulse generator, connected in series. ### Claim 6 (depends on 4, 5) The apparatus of claims 4 and 5 wherein the high-voltage DC pulse generator with positive and negative output electrodes, with the positive output electrode electrically connected to the positive track and the negative output electrode electrically connected to the negative track. ### Claim 7 (depends on 6) The apparatus of claim 6 wherein the cleaning mechanism is a module mounted to the window screen frame consisting of a self-contained method of locomotion, comprising a motor that drives a friction wheel that propels the module across the plane of the apparatus. ### Claim 8 (depends on 7) The apparatus of claim 7 wherein the cleaning mechanism consists of a friction cleaning device, comprising a brush mounted to an axel that is connected to the mechanism's motor such that the brush is spun across plane of the wire mesh, physically dislodging trapped particulate. ### Claim 9 (depends on 7) The apparatus of claim 7 wherein the cleaning mechanism consists of a fluid compressor that propels a column of high-velocity fluid, across the plane of the wire mesh. ### Claim 10 A window screen apparatus that utilizes electrostatic properties to purify the air passing through or in the vicinity of the apparatus comprising: a. a window screen frame designed to fit and latch into the window frame for which the apparatus is designed to be mounted; and b. a wire mesh screen, consisting of interwoven or cross-hatched wires, mounted to the window screen frame; and c. a cleaning mechanism mounted to the window screen frame that cleans the wire mesh screen. ### Claim 11 (depends on 10) The apparatus of claim 10 wherein the wire used to create the screen mesh wholly or partially consists of permanently electrostatically-charged fibers. ### Claim 12 (depends on 11) The apparatus of claim 11 wherein the cleaning mechanism is a module mounted to the window screen frame consisting of a self-contained method of locomotion, comprising a motor that drives a friction wheel that propels the module across the plane of the apparatus. ### Claim 13 (depends on 12) The apparatus of claim 12 wherein the cleaning mechanism consists of a friction cleaning device, comprising a brush mounted to an axel that is connected to the mechanism's motor such that the brush is moved across the plane of the wire mesh, physically dislodging trapped particulate. ### Claim 14 (depends on 12) The apparatus of claim 12 wherein the cleaning mechanism consists of a fluid compressor that propels a column of high-velocity fluid across the plane of the wire mesh.