Patents by Inventor Stefan Niederhofer

Stefan Niederhofer 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).

  • Device and method for developing a charge image
    Patent number: 7099608
    Abstract: In a device and method for developing a charge image on a photoconductor of an electrophotographic printer or copier, a developer chamber is provided having a first and a second end in which at least a portion of the developer is contained. A mixer is provided for thoroughly mixing the developer in the developer chamber. The mixer generates a flow of the developer that is directed from a first end of the developer chamber to a second end. An inlet for developer is provided at the first end of the developer chamber and an overflow is provided at the second end. The developer exits the developer chamber via the overflow when its level in the region of the second end exceeds a prescribed height. A conveyor conveys the developer that has exited the developer chamber at the overflow toward the inlet.
    Type: Grant
    Filed: May 25, 2004
    Date of Patent: August 29, 2006
    Assignee: Oce Printing Systems GmbH
    Inventors: Ralf Selinger, Uwe Höllig, Stefan Niederhofer
  • Device and method to lift magnetizable carrier particles from a mixture of toner particles and magnetizable carrier particles
    Patent number: 6975826
    Abstract: In a device and method for lifting magnetizable carrier particles from a mixture of toner particles, a cover of a collecting element interface device is arranged such that it can be rotated around a stator with a magnet. The cover comprises a spiral that, given rotation of the cover, conveys the carrier particles in an axial direction.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: December 13, 2005
    Assignee: Océ Printing Systems GmbH
    Inventors: Ralf Selinger, Uwe Huellig, Stefan Niederhofer
  • Device and method for developing a charge image
    Publication number: 20040247342
    Abstract: In a device and method for developing a charge image on a photoconductor of an electrophotographic printer or copier, a developer chamber is provided having a first and a second end in which at least a portion of the developer is contained. A mixer is provided for thoroughly mixing the developer in the developer chamber. The mixer generates a flow of the developer that is directed from a first end of the developer chamber to a second end. An inlet for developer is provided at the first end of the developer chamber and an overflow is provided at the second end. The developer exits the developer chamber via the overflow when its level in the region of the second end exceeds a prescribed height. A conveyor conveys the developer that has exited the developer chamber at the overflow toward the inlet.
    Type: Application
    Filed: May 25, 2004
    Publication date: December 9, 2004
    Inventors: Ralf Selinger, Uwe Hollig, Stefan Niederhofer
  • Device and method to lift magnetizable carrier particles from a mixture of toner particles and magnetizable carrier particles
    Publication number: 20040105706
    Abstract: In a device and method for lifting magnetizable carrier particles from a mixture of toner particles, a cover of a collecting element interface device is arranged such that it can be rotated around a stator with a magnet. The cover comprises a spiral that, given rotation of the cover, conveys the carrier particles in an axial direction.
    Type: Application
    Filed: September 26, 2003
    Publication date: June 3, 2004
    Inventors: Ralf Selinger, Uwe Hoellig, Stefan Niederhofer