Granted Patent
Utility
US 5,567,018 · App. 08/423,382
Continuous mining linear advance system
Inventor:
Wm. Mark Hart
Patented Case
View Patent ↗
Granted: Oct 22, 1996
Filed: Apr 17, 1995
Inventor
Wm. Mark Hart
Assignee (at issue)
Cyprus Amax Minerals Company
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.