December 05, 2012
A Wisconsin federal judge on Tuesday found that parts of an Astec Industries Inc. patent covering rock-crushing technology were invalid, siding with Metso Minerals Industries Inc., which had sued to prevent an Astec unit from pursuing infringement allegations.
October 25, 2010
Global mining and construction giant Metso Minerals Industries Inc. has taken rival Astec Industries Inc. to court in an attempt to invalidate its patent for a rock crushing machine.