Patents by Inventor Wilfred E. Vail

Wilfred E. Vail has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Carrier materials
    Patent number: 5994015
    Abstract: Improved carrier materials for use in electrophotographic processes and processes for producing such carrier materials are disclosed. The carrier materials feature a preferably conductive core coated with an first conductive layer and a second, insulative layer. The coating layers preferably comprise a fluoropolymer matrix or other triboelectrically chargeable substance or substances. In one embodiment the same fluoropolymer is used in the first and second coatings.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: November 30, 1999
    Assignee: Nashua Corporation
    Inventor: Wilfred E. Vail
  • Coated carrier particle containing a charge control agent
    Patent number: 5627001
    Abstract: An improved carrier particle for use with a toner in electrostatic copying is described. The particle comprises an electroconductive core and a coating. In one embodiment the coating is made by combining a fluorocarbon resin with a charge control agent that has the same polarity as the toner. The carrier imparts a strongly positive triboelectric charge to the toner while resisting adhesion of toner particles.
    Type: Grant
    Filed: October 5, 1995
    Date of Patent: May 6, 1997
    Assignee: Nashua Corporation
    Inventor: Wilfred E. Vail