Granted Patent
Utility
US 6,595,443 · App. 10/010,913
Method and device for crushing material in a crushing plant using multistep crushing
Inventor:
Christian Ottergren
Patented Case
View Patent ↗
Granted: Jul 22, 2003
Filed: Dec 6, 2001
Inventor
Christian Ottergren
Assignee (at issue)
SANDVIK AB
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.