Granted Patent
Utility
US 6,772,970 · App. 09/758,677
Gyratory crusher spider piston
Inventors:
Dale C. Davis, Albert Van Mullem
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Jan 11, 2001
Inventors
Dale C. Davis
Albert Van Mullem
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.