Patents by Inventor David Daniel Dreyfuss

David Daniel Dreyfuss 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).

  • Printing apparatus with focusing of toner particles
    Patent number: 6254221
    Abstract: Various methods and apparatus are disclosed for facilitating the loading, transportation, and modulation of toner particles on a print head, as well as the transfer of toner particles onto a print medium. These methods and apparatus relate to the optimization of various elements on the print head to improve the speed and control of toner particles on the print head, as well as to the alteration of the electric field in the vicinity of the end of the print head.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: July 3, 2001
    Assignee: Lexmark International, Inc.
    Inventors: Erik Christopher Bard, Gary Allen Denton, David Daniel Dreyfuss
  • Toner transport device having electrically altered launch runway and particle flow dividers
    Patent number: 6161921
    Abstract: Various methods and apparatus are disclosed for facilitating the loading, transportation, and modulation of toner particles on a print head, as well as the transfer of toner particles onto a print medium. These methods and apparatus relate to the optimization of various elements on the print head to improve the speed and control of toner particles on the print head, as well as to the alteration of the electric field in the vicinity of the end of the print head.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: December 19, 2000
    Assignee: Lexmark International, Inc.
    Inventors: Erik Christopher Bard, Gary Allen Denton, David Daniel Dreyfuss
  • Scanning print head
    Patent number: 6154238
    Abstract: Various methods and apparatus are disclosed for facilitating the loading, transportation, and modulation of toner particles on a print head, as well as the transfer of toner particles onto a print medium. These methods and apparatus relate to the optimization of various elements on the print head to improve the speed and control of toner particles on the print head, as well as to the alteration of the electric field in the vicinity of the end of the print head, and to the use of a scanning print head.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: November 28, 2000
    Assignee: Lexmark International, Inc.
    Inventors: William Paul Cook, Gary Allen Denton, David Daniel Dreyfuss
  • Optimization of transport parameters for traveling wave toner transport devices
    Patent number: 6123417
    Abstract: Various methods and apparatus are disclosed for facilitating the loading, transportation, and modulation of toner particles on a print head, as well as the transfer of toner particles onto a print medium. These methods and apparatus relate to the optimization of various elements on the print head to improve the speed and control of toner particles on the print head, as well as to the alteration of the electric field in the vicinity of the end of the print head.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: September 26, 2000
    Assignee: Lexmark International, Inc.
    Inventors: Erik Christopher Bard, Gary Allen Denton, David Daniel Dreyfuss
  • Traveling wave and vertical toner transfer
    Patent number: 6079815
    Abstract: Various methods and apparatus are disclosed for facilitating the loading, transportation, and modulation of toner particles on a print head, as well as the transfer of toner particles onto a print medium. These methods and apparatus relate to the optimization of various elements on the print head to improve the speed and control of toner particles on the print head, as well as to the alteration of the electric field in the vicinity of the end of the print head, and the transfer of toner particles vertically from the print head.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: June 27, 2000
    Assignee: Lexmark International, Inc.
    Inventors: William Paul Cook, Gary Allen Denton, David Daniel Dreyfuss
  • Combined electrophotographic and ink jet printing
    Patent number: 5751299
    Abstract: Standard, unfixed electrophotographic images are transferred from a photoconductor drum (5) to paper (7) at a nip location with a transfer roller (3). The paper remains in contact with the transfer roller until it is positioned under a ink jet printhead (9), where a second image, typically color highlights, is printed. This configuration requires no additional registration of the two images. The ink jet printhead may be charged to repel stray toner which might clog its nozzles. The transfer member may be a belt or may be large enough to permit movement of the paper at the higher speeds of electrophotographic at the transfer station and at the lower speeds of ink jet printing when the paper is at the ink jet printing station.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: May 12, 1998
    Assignee: Lexmark International, Inc.
    Inventors: Gary Allen Denton, David Daniel Dreyfuss