Patents by Inventor John R. Manhardt

John R. Manhardt 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).

  • Developing latent electrostatic images using a liquid toner and a development electrode
    Patent number: 4322488
    Abstract: A method and apparatus for developing a latent electrostatic image on the surface of an electrophotographic member using a liquid toner and a development electrode. An AC bias voltage is applied between the electrophotographic member and the development electrode during the developing operation to prevent the formation of spatially stable convection cells in the liquid toner.
    Type: Grant
    Filed: January 30, 1980
    Date of Patent: March 30, 1982
    Assignee: Coulter Systems Corporation
    Inventors: Manfred R. Kuehnle, John R. Manhardt, Malor Wright