Granted Patent
Utility
US 5,140,907 · App. 07/797,604
Method for surface mining with dragline and blast casting
Inventor:
Steven M. Svatek
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Nov 25, 1991
Inventor
Steven M. Svatek
Assignee (at issue)
Atlantic Richfield 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.