Patents by Inventor Franz Buttner

Franz Buttner 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 containing a coating strip on its sliding surface
    Patent number: 3980312
    Abstract: A ski comprising at least one coating strip applied to at least a portion of its sliding surface, wherein at least a part of the coating strip is interchangeable, said coating strip being removably affixed to the underside of the ski.
    Type: Grant
    Filed: January 29, 1975
    Date of Patent: September 14, 1976
    Inventor: Franz Buttner