Patents by Inventor Alfred E. Fields

Alfred E. Fields 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).

  • Developer compositions having electrically conducting filaments in carrier particle matrix
    Patent number: 4148640
    Abstract: An electrographic developer contains a mixture of toner powder particles and carrier particles comprising tendrillar electrically conducting filaments substantially uniformly distributed in a matrix, said filaments, matrix and toner particles being triboelectrically balanced. Improved electrographic toner images are achieved by the use of the dry developers.
    Type: Grant
    Filed: March 11, 1974
    Date of Patent: April 10, 1979
    Assignee: Eastman Kodak Company
    Inventors: William J. Dulmage, Alfred E. Fields