Patents Assigned to Chapman Corporation
  • Performance indicator for an electrical static eliminator device
    Patent number: 6075449
    Abstract: An electrical static eliminator device performance indicator including a sensor for sensing the ion flow from an emitter point of the static eliminator device and also for sensing the presence of a voltage at an emitter point to accurately detect the fouling of a point or shorted point condition; a display, responsive to the means for sensing, for displaying an indication of a fouled emitter point or a shorted emitter point; and an electrical circuit interconnecting the sensor and the display.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: June 13, 2000
    Assignee: Chapman Corporation
    Inventor: Chandler G. Sinnett
  • Surface cleaner and collector system
    Patent number: 5836044
    Abstract: A surface cleaner and collector system includes: a chamber having an opening for receiving a surface to be cleaned; at least one pressurized air delivery system proximate the surface for establishing an air flow for loosening and entraining contaminants on the surface; a sealing system for sealing the chamber and creating a positive pressure therein; and a collector for trapping the entrained contaminants and passing the air flow.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: November 17, 1998
    Assignee: Chapman Corporation
    Inventors: Chandler G. Sinnett, Marshall Edward Hall
  • Self-balancing circuit for convection air ionizers
    Patent number: 5008594
    Abstract: A self-balancing circuit for convection air ionizers with a passively balanced ion emitter and collector including a circuit in which the ion emitter and the collector are capacitively isolated from external charge sources or sinks for maintaining balance in the positive and negative charge for producing a zero average current flow and a charge balanced ionized airstream.
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: April 16, 1991
    Assignee: Chapman Corporation
    Inventors: Ralph W. Swanson, Daniel F. Gagnon, Donald G. Parent