Granted Patent
Utility
US 5,692,807 · App. 08/501,741
Highwall mining apparatus
Inventor:
Joseph J. Zimmerman
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Aug 9, 1995
Inventor
Joseph J. Zimmerman
Assignee (at issue)
Joy MM Delaware, Inc.
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.