Patents by Inventor Ralf Spãth

Ralf Spãth 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).

  • Drive for a Hydraulic Excavator
    Publication number: 20100236232
    Abstract: The present invention relates to a drive for an excavator with a number of individual drives, such as a slewing gear drive, a hoist drive, a bucket drive and an arm drive, wherein for the slewing gear drive two reversible adjusting units are provided, which are at least coupled with an energy accumulator.
    Type: Application
    Filed: March 22, 2010
    Publication date: September 23, 2010
    Applicant: LIEBHERR FRANCE SAS
    Inventors: Daniel Boehm, Thomas Landmann, Ralf Spãth