US Patent Issued to Wirtgen on March 31 for "Self-propelled earth working machine having a canopy variable in length in the longitudinal direction of the machine" (German Inventors)

ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,424, issued on March 31, was assigned to Wirtgen GmbH (Windhagen, Germany).

"Self-propelled earth working machine having a canopy variable in length in the longitudinal direction of the machine" was invented by Stephan Drumm (VettelschoB, Germany) and Roland Lull (Konigswinter, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a self-propelled earth working machine (10) for removing material and/or changing a density of ground material and/or changing a ground surface (AO) and/or applying material onto a ground area (U), the earth working machine (10) comprising: a machine frame (12), a traveling gear (22) supp...