Patents by Inventor Charles T. Havens

Charles T. Havens 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).

  • Chemically prepared porous toner
    Patent number: 8192909
    Abstract: The present invention provides a porous toner. The porous toner has a porosity of greater that 20 percent. The toner can include vinyl polymers, copolymers of styrene monomers and polyesters. In addition a method of manufacture of the toner particles is provided.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: June 5, 2012
    Assignee: Eastman Kodak Company
    Inventors: Xin Jin, Jason Morgan, Charles T. Havens
  • Toner composition
    Patent number: 7914963
    Abstract: The present invention is a toner that includes a polymeric binder and a polyethylene wax or ester wax. A dispersing agent of poly(ethylene vinyl acetate) is included in the toner that dispersed the wax and reduces the amount of free wax particles.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: March 29, 2011
    Assignee: Eastman Kodak Company
    Inventors: Robert D. Fields, Charles T. Havens, Peter S. Alexandrovich, Dinesh Tyagi
  • TONER COMPOSITION
    Publication number: 20090155704
    Abstract: The present invention is a toner that includes a polymeric binder and a polyethylene wax or ester wax. A dispersing agent of poly(ethylene vinyl acetate) is included in the toner that dispersed the wax and reduces the amount of free wax particles.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 18, 2009
    Inventors: Robert D. Fields, Charles T. Havens, Peter S. Alexandrovich, Dinesh Tyagi
  • Silver halide photographic film utilizing cellulose triacetate support with two antistatic layers
    Patent number: 5472833
    Abstract: A process for making a photographic film support comprising applying a film forming coating composition containing an antistat agent to a first clear transparent polymeric film to form an antistat layer on the polymeric film and overcoating the free surface of the antistat layer with a second polymeric film having the same chemical composition as the first polymeric film.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: December 5, 1995
    Assignee: Eastman Kodak Company
    Inventors: Charles T. Havens, John E. Rieth, Alfred B. Fant, Raymond T. Jones
  • Antistat coating compositions and antistat layers formed therefrom
    Patent number: 5356468
    Abstract: Coating composition, antistat layer and photographic element having a V.sub.2 O.sub.5 antistat layer, the layer containing an amount of cellulose nitrate to prevent precipitation of the V.sub.2 O.sub.5 in the presence of film base.
    Type: Grant
    Filed: May 27, 1993
    Date of Patent: October 18, 1994
    Assignee: Eastman Kodak Company
    Inventors: Charles T. Havens, Raymond T. Jones, John M. Fukushima, Jack J. Holt