Patents by Inventor Thomas Karl Dykstra

Thomas Karl Dykstra 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).

  • Electrographic toner and developer composition containing a 4-aza-1-azoniabicyclo(2.2.2) octane salt as a charge control agent
    Patent number: 4079014
    Abstract: The present invention relates to the use of 4-aza-1-azoniabicyclo(2.2.2)octane salts as charge control agents for an electrostatic toner contained in dry electrographic developer compositions. These charge control agents preferably have the formula ##STR1## wherein R is an aliphatic organic group having from 4 to about 30 carbon atoms, and X is an anion.
    Type: Grant
    Filed: July 21, 1976
    Date of Patent: March 14, 1978
    Assignee: Eastman Kodak Company
    Inventors: Donald MacArthur Burness, Thomas Karl Dykstra, Thomas Arthur Jadwin, Hans Gway Ling