Patents by Inventor David Hockey

David Hockey 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).

  • Image forming apparatus with variable toning bias offset service utility
    Patent number: 6724998
    Abstract: An electrophotographic print engine has a variable primary charger and toning bias which places the machine in abnormal reproduction modes in order to provide service and diagnostic information to troubleshoot subsystems involved in the electrophotographic process.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: April 20, 2004
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Matthias Regelsberger, David Hockey, Anne Lairmore
  • Service routine to identify causes for image artifacts in printed output
    Patent number: 6459859
    Abstract: A method and apparatus for identifying the root causes of image artifacts visible in the printed output of an electrophotographic printer, activating a special operating mode for the marking engine, and referencing the printing process intentionally to each rotating member of the electrophotographic process in turn. The referencing insures that image artifacts and/or non-uniformities originating from each rotating member are visible in the same location on each printed output. Since the rotating members employed are intentionally designed to be different in diameter, the referencing of the printing process to each one of the rotating members in conjunction with variable receiver sizes enables an operator to associate each image artifact or non-uniformity with a specific rotating member causing it. The appearance of image artifacts is enhanced through zero offset voltage printing and flat-field exposure of the rotating member images as appropriate.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: October 1, 2002
    Assignee: Heidelberg Digital L.L.C.
    Inventors: Matthias H. Regelsberger, David Hockey
  • Method and apparatus for monitoring parameters corresponding to operation of an electrophotographic marking machine
    Patent number: 6427053
    Abstract: An electrophotographic marking machine is described including a first set of data with a plurality of parameters corresponding to a plurality of prior electrophotographic markings or frames. The electrophotographic marking machine further includes a second set of data selected from the first set of data based upon a predetermined set of criteria. In addition, the electrophotographic marking machine has a volatile storage device for storing the first set of data, and a non-volatile storage device for storing the second set of data. A method for assessing operability of an electrophotographic marking machine is also described.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: July 30, 2002
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Edward M. Eck, Matthias H. Regelsberger, Philip Stern, David Hockey
  • Method and apparatus for monitoring parameters corresponding to operation of an electrophotographic marking machine
    Publication number: 20020044783
    Abstract: An electrophotographic marking machine is described including a first set of data with a plurality of parameters corresponding to a plurality of prior electrophotographic markings or frames. The electrophotographic marking machine further includes a second set of data selected from the first set of data based upon a predetermined set of criteria. In addition, the electrophotographic marking machine has a volatile storage device for storing the first set of data, and a non-volatile storage device for storing the second set of data. A method for assessing operability of an electrophotographic marking machine is also described.
    Type: Application
    Filed: April 2, 2001
    Publication date: April 18, 2002
    Inventors: Edward M. Eck, Matthias H. Regelsberger, Philip Stern, David Hockey
  • Image forming apparatus with variable toning bias offset service utility
    Publication number: 20010036372
    Abstract: An electrophotographic print engine has a variable primary charger and toning bias which places the machine in abnormal reproduction modes in order to provide service and diagnostic information to troubleshoot subsystems involved in the electrophotographic process.
    Type: Application
    Filed: March 16, 2001
    Publication date: November 1, 2001
    Applicant: Heidelberg Digital L.L.C.
    Inventors: Matthias Regelsberger, David Hockey, Anne Lairmore