doesn't mean it is valid. that is what the courts are for. Its like getting a license to drive. you get your license and take the car out for a spin. you get a DUI (lose your patent case) and you lose your license.

  http://www.tms.org/pubs/journals/JOM/matters/matters-9007.html

Maybe this is just some massive scale bet on the recovery of steel and aluminum in the markets. He can always recycle the raw materials whenever the prices on them jump