Patents by Inventor David L. Merrifield

David L. Merrifield 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).

  • Patent number: 6980767
    Abstract: An improved electrophotographic printer is provided for printing on sheet media, and for joining two or more sheets of sheet media together within the print engine. A first sheet can be imaged with “standard” information and/or indicia, and can also have one or more strips of toner applied at predetermined locations. The first sheet is then run back to the print engine while a second (virgin) sheet of print media is picked from an input tray at a time that will cause both sheets to run through the print engine simultaneously, either exactly at the same time, or with some offset spacing. The two sheets will become joined or affixed to one another at locations in which the toner strips are of sufficient size and density, and will be output together as if stapled, or sealed, together.
    Type: Grant
    Filed: November 11, 2004
    Date of Patent: December 27, 2005
    Assignee: Lexmark International, Inc.
    Inventors: Daniel P. Cahill, David L. Merrifield
  • Patent number: 5337032
    Abstract: A toner cartridge having no toner pump with the toner adding roller (11 ) positioned horizontal to the developer roller (3), the toner chamber (9) located predominantly below the developer roller, the photoconductive drum located 120 degrees from the top of tile developer roller, and the doctor blade (5) is located near the top. The cartridge has a minimal number of operational parts.
    Type: Grant
    Filed: February 26, 1993
    Date of Patent: August 9, 1994
    Assignee: Lexmark International, Inc.
    Inventors: Ronald W. Baker, Robert L. Burdick, Martin V. DiGirolamo, Paul D. Horrall, David L. Merrifield, James J. Molloy, Earl D. Ward, II, Bernard L. Wilzbach
  • Patent number: 5331378
    Abstract: In a toner cartridge, photoconductor drum (11) is driven by a gear (3) which is in the printer, toner adder roller (48) is driven independently by a face coupling (5) which is in the printer. On the opposite side, a gear train from toner adder roller (48) drives developer roller (42) and toner paddle (52). The two systems permit the cartridge to function in different printers requiring different ratios of speeds. Stiffness requirements of the cartridge are reduced. Movements are more consistent, and space utilization is enhanced.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: July 19, 1994
    Assignee: Lexmark International, Inc.
    Inventors: Ronald W. Baker, Robert L. Burdick, Martin V. DiGirolamo, David L. Merrifield, James J. Molloy, Paul D. Horrall, Gary M. Tylicki, Earl D. Ward, II, Bernard L. Wilzbach