ApplicationNo. 05/179399 filed on 09/10/1971
US Classes:210/243, ELECTRICAL INSULATING OR ELECTRICITY DISCHARGING210/504, With adhered coating or impregnant210/508, Fibrous55/358, WITH GROUND SUPPORT MEANS (NONFLOW CONDUCTING)55/498, Spiral or cylindrical55/502, Gasket or sealing means55/510, Annular unit held between dished or plate-like end members for top and bottom support55/512, Discrete fibrous or particulate solids55/520, SPIRAL FILTER MEDIA55/521, ZIGZAG, CORRUGATED, OR CONICAL55/522, SPECIFIC MEDIA MATERIAL55/524, With coating, impregnant, or bonding agent55/527, Fibrous or strand form55/528, Organic (e.g., vegetable)96/54, Having alternating electrostatic field96/98Collecting electrode details (e.g., sheet type, running length web, etc.)
ExaminersPrimary: Granger, Theodore A.
Attorney, Agent or Firm
International ClassesB01D 39/20 (20060101)
B01D 39/08 (20060101)
B01D 35/06 (20060101)
AbstractConductive filter elements are made by treating nonconductive fibrous materials such as inorganic or organic fibers with resins containing finely divided carbon. The treated fibers are then fabricated into filter elements which are electrically conductive throughout. Strands of roving or yarn which are nonconductive may be joined by twisting together with strands of conductive roving or yarn to give conductivity to the finished multiple strand. Conductive filter elements are also made from extruded fibers which are filled with carbonaceous material during extrusion. These elements permit grounding of static electrical potential which would otherwise accumulate in a nonconductive element. If desired, a controlled low potential direct or alternating electrical charge can be maintained on the filter element to enhance the separation of particles of opposite charge. Particulate filter media, such as that used in filter beds, may also be treated with carbon to form an electrically conductive filter mass.