Patents by Inventor Minerva Piffarerio

Minerva Piffarerio 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).

  • Method of addition of extra particulate additives to image forming material
    Publication number: 20080090167
    Abstract: The present invention relates to a method for combining extra particulate additive with toner. The method includes mixing toner and extra particulate additive in a conical mixer having temperature control. The toner may contain polymeric material having a glass transition temperature (Tg) and the mixing may be carried out wherein the temperature of the mixture is maintained at a temperature less than Tg. The above method may also be applied to a toner formulation that has first undergone a rounding operation.
    Type: Application
    Filed: October 13, 2006
    Publication date: April 17, 2008
    Inventors: Ligia Aura Bejat, John Earley, Rick Owen Jones, George Pharris Marshall, John Melvin Olson, Trent Peter, Minerva Piffarerio, Vincent Wen-Hwa Ting, Ronald James Whildin
  • Closed air circulation toner rounding
    Patent number: 6991886
    Abstract: Toner is rounded by vigorously mixing less than about 5 percent by weight of particulate silica to the total weight of a starting toner in a closed, recirculating air system. The starting toner contains at least about 4.5 percent by weight of the starting toner of a wax and additionally contains at least 5 percent by weight of the starting toner of a softening agent. The temperature during the mixing is no more than 13 degrees C. above the onset of the glass transition temperature of the starting toner. The final toner comprises rounded starting toner having particulate silica embedded during the mixing process.
    Type: Grant
    Filed: June 7, 2004
    Date of Patent: January 31, 2006
    Assignee: Lexmark International, Inc.
    Inventors: John Joseph Earley, George Pharris Marshall, John Melvin Olson, Trent Duane Peter, Minerva Piffarerio, Vincent Wen-Hwa Ting, Ronald James Whildin
  • CLOSED AIR CIRCULATION TONER ROUNDING
    Publication number: 20050255401
    Abstract: Toner is rounded by vigorously mixing less than about 5 percent by weight of particulate silica to the total weight of a starting toner in a closed, recirculating air system. The starting toner contains at least about 4.5 percent by weight of the starting toner of a wax and additionally contains at least 5 percent by weight of the starting toner of a softening agent. The temperature during the mixing is no more than 13 degrees C. above the onset of the glass transition temperature of the starting toner. The final toner comprises rounded starting toner having particulate silica embedded during the mixing process.
    Type: Application
    Filed: June 7, 2004
    Publication date: November 17, 2005
    Inventors: John Earley, George Marshall, John Olson, Trent Peter, Minerva Piffarerio, Vincent Ting, Ronald Whildin
  • Toner particulates comprising an ethylene propylene wax
    Patent number: 6331372
    Abstract: Toner particulates include a first resin comprising a cross-linked copolymer; a second resin comprising a non-cross-linked copolymer; and a wax comprising an ethylene propylene copolymer. The cross-linked copolymer is a copolymer other than the wax comprising an ethylene propylene copolymer and the non-cross-linked polymer is a copolymer other than the wax comprising an ethylene propylene copolymer.
    Type: Grant
    Filed: October 8, 1999
    Date of Patent: December 18, 2001
    Assignee: Lexmark International, Inc.
    Inventors: Bryan Patrick Livengood, James Craig Minor, Michael Thomas Moore, John Melvin Olson, Minerva Piffarerio, Vincent Wen-Hwa Ting