Patents by Inventor Stefan Hasenzahl

Stefan Hasenzahl 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).

  • Dampening-unit roller of a printing machine
    Patent number: 6029571
    Abstract: Dampening-unit roller for a dampening unit of a printing machine includes a roller body having an outer cylindrical surface, and a coating on the outer cylindrical surface, the coating including or consisting of an oxide of zirconium and/or an oxide of yttrium.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: February 29, 2000
    Assignees: Heidelberger Druckmaschinen AG, Coatec Gesellschaft fuer Oberflaechenveredelung mbH
    Inventors: Gerhard Johner, Stefan Hasenzahl, Jurgen Kern
  • Printing machine roller and method of production thereof
    Patent number: 5647279
    Abstract: The hydrophilic properties of a printing-machine roller are adjusted with a coating applied on an outer surface of its cylindrical body. The coating contains at least 45% by weight of pure silicon, or it is formed exclusively of chemically pure silicon. The coating is between 0.2 and 2 mm thick and its surface roughness R.sub.z is no more than 5 .mu.m.
    Type: Grant
    Filed: July 10, 1995
    Date of Patent: July 15, 1997
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Gerhard Johner, Stefan Hasenzahl, Juergen Kern