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US Patent 5220481 - Composite to enable contact electrostatic voltage sensing
US Patent Issued on June 15, 1993
Estimated Patent Expiration Date:
November 21, 2011Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
November 21, 2011Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA contact for use in contacting a moving photoreceptor surface, is formed from a structure (preferably a pultrusion) including a plurality of continuous strand fibers of high electrical resistance, and a thermally stable insulating component between the resistive fibers. The resistive fibers are configured to form a brush extending from the insulating component for contact with the photoreceptor surface. The resistance of the fibers is sufficiently high to reduce leakage of surface charges away from the photoreceptor and to provide a high resistance between adjacent fibers. The insulating component, which serves to interface the carbon filaments from each other and from a host polymer may comprise an organic compound, such as a polyimide composition, or may comprise an inorganic compound such as Al2 O3 or water glass, and is thermally stable below about 1000° C. The host polymer, on the other hand volatilizes rapidly and cleanly upon direct exposure to laser energy. | InventorsAssigneeApplicationNo. 795563 filed on 11/21/1991US Classes:361/225, ELECTRIC CHARGING OF OBJECTS OR MATERIALS310/251, Structure (e.g., composite material)355/118Divided or flexible platenField of Search355/118, Divided or flexible platen310/251, Structure (e.g., composite material)361/225, ELECTRIC CHARGING OF OBJECTS OR MATERIALS361/212, DISCHARGING OR PREVENTING ACCUMULATION OF ELECTRIC CHARGE (E.G., STATIC ELECTRICITY)361/220, Specific conduction means or dissipator361/221, Brush- or roller-type structure361/214Of paper or paper handling machineExaminersPrimary: DeBoer, Todd E.Assistant: Krishnan, Aditya Attorney, Agent or FirmUS Patent References4106869, Distance compensated electrostatic voltmeterIssued on: 08/15/1978 Inventor: Buchheit4149119, Combined AC-DC electrometer with AC feedback for drift compensation Issued on: 04/10/1979 Inventor: Buchheit4336565, Charge process with a carbon fiber brush electrode Issued on: 06/22/1982 Inventor: Murray , et al.4358699, Versatile electrical fiber brush and method of making Issued on: 11/09/1982 Inventor: Wilsdorf4455078, Charging device having a conductive particle impregnated strand lined contact member Issued on: 06/19/1984 Inventor: Mukai , et al.4569583, Electrostatic charge probe for electrophotographic apparatus Issued on: 02/11/1986 Inventor: Robson , et al.4741873, Method for forming rigid composite preforms Issued on: 05/03/1988 Inventor: Fischer , et al.4761709, Contact brush charging Issued on: 08/02/1988 Inventor: Ewing , et al.4801967Voltage sensing in A.C. corotrons Issued on: 01/31/1989 Inventor: Snelling International ClassesH01R 039/24G03G 013/02 |
