Patents by Inventor Kent W. Hemphill

Kent W. Hemphill 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).

  • Transfer of dry developed electrostatic image using plural oppositely charged fields
    Patent number: 4141728
    Abstract: An improved method of transferring an electrostatically developed image from a photoreceptor to a transfer member (e.g., a sheet of paper) in contact with the image including simultaneously (1) charging the transfer member to a polarity opposite to that of the toner forming the developed image, (2) exposing a photoconductive surface of the photoreceptor to light, and (3) charging the photoconductive surface to the same polarity as that of the toner particles.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: February 27, 1979
    Assignee: Xerox Corporation
    Inventor: Kent W. Hemphill
  • Method of cleaning a photoreceptor
    Patent number: 4121947
    Abstract: Charged residual toner is removed from a photoreceptor by simultaneously (1) exposing the photoconductive layer of the photoreceptor to light, (2) charging the photoconductive layer to the same polarity as that of the toner, (3) vibrating the photoreceptor to dislodge the toner by entraining the photoreceptor about a roller while rotating the roller about an eccentric axis, and (4) subjecting the toner to a force (e.g. vacuum or gravity) which draws the toner away from the photoreceptor.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: October 24, 1978
    Assignee: Xerox Corporation
    Inventor: Kent W. Hemphill
  • Optical system for alternatively projecting adjacent images of adjacent objects or double images of a single object
    Patent number: 4088401
    Abstract: An optical system is disclosed for substantially doubling the capacity of a photocopying apparatus or the like. It provides alternative modes of operation; adjacent imaging of adjacent objects or double imaging of a single object. In the adjacent imaging mode, a single projection lens projects adjacent images of two adjacent objects in a straightforward way. In the alternative double imaging mode, a pair of projection lenses projects twin images of a single object along "parallel" optical paths.
    Type: Grant
    Filed: January 3, 1977
    Date of Patent: May 9, 1978
    Assignee: Xerox Corporation
    Inventors: James D. Rees, Kent W. Hemphill