Patents by Inventor John M. Spence

John M. Spence 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).

  • Two component electrophotographic developers and preparation method
    Patent number: 5480757
    Abstract: A two component electrophotographic developer and development method. The developer includes carrier particles and toner comprising: polymeric binder; a first agent selected from the group consisting of compounds having the general structure: ##STR1## wherein n is from about 7 to about 21; R.sup.1 and R.sup.2 are each independently H or alkyl having from 1 to about 3 carbons; T represents an unshared electron pair or a proton and a counterion; and R.sup.3 is substituted or unsubstituted alkyl, alkylamide, aryl, or heteroaryl; and a second agent comprising quaternary ammonium salt.
    Type: Grant
    Filed: June 8, 1994
    Date of Patent: January 2, 1996
    Assignee: Eastman Kodak Company
    Inventors: Thomas A. Jadwin, Hans W. Osterhoudt, John M. Spence, Dinesh Tyagi
  • Toner composition and method of making
    Patent number: 4912009
    Abstract: An electrophotographic dry toner having excellent properties with respect to charging, RH stability and fusing is made in a process in which the binder polymer is formed by suspension polymerizing a styrene-acrylic monomer mixture in the presence of a polyester-promoted colloidal silica suspending agent which is free of other hydrophilic polymers. The resulting polymer is melt blended with toner addenda such as a colorant and a charge control agent and the mixture is pulverized to form the toner composition.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: March 27, 1990
    Assignee: Eastman Kodak Company
    Inventors: Allan R. Amering, Dennis E. Smith, John M. Spence
  • Electrophotographic toner and developer compositions containing dioctylsulfosuccinate and sodium benzoate charge control agents
    Patent number: 4814250
    Abstract: A particulate electrophotographic toner includes a binder polymer having dispersed therein an amount, effective to control the charge on the toner particles, of a mixture of sodium dioctylsulfosuccinate and sodium benzoate.
    Type: Grant
    Filed: March 17, 1987
    Date of Patent: March 21, 1989
    Assignee: Eastman Kodak Company
    Inventors: Michelle S. Kwarta, Howard J. Helenbrook, John M. Spence