Patents by Inventor Hans-Joachim Plenk

Hans-Joachim Plenk 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).

  • Ski
    Patent number: 4585249
    Abstract: A ski, particularly a cross-country ski having improved sliding and adhering properties, which comprises a running surface subdivided into at least two zones, which can include an obtuse angle between them, and/or wedge-shaped parts on its top surface.
    Type: Grant
    Filed: January 12, 1983
    Date of Patent: April 29, 1986
    Assignee: Jochen Plenk K.G.
    Inventor: Hans-Joachim Plenk
  • Ski with non-symmetrical running surface
    Patent number: 4262925
    Abstract: A ski, particularly a cross-country ski having improved sliding and adhering properties, which comprises a running surface subdivided into at least two zones, which can include an obtuse angle between them, and/or wedge-shaped parts on its top surface.
    Type: Grant
    Filed: December 1, 1978
    Date of Patent: April 21, 1981
    Assignee: Jochen Plenk KG
    Inventor: Hans-Joachim Plenk
  • Ski
    Patent number: 4147377
    Abstract: A ski, particularly a cross-country ski having improved sliding and adhering properties, which comprises a running surface subdivided into at least two zones, which can include an obtuse angle between them, and/or wedge-shaped parts on its top surface.
    Type: Grant
    Filed: December 23, 1976
    Date of Patent: April 3, 1979
    Assignee: Jochen Plen, KG
    Inventor: Hans-Joachim Plenk