Granted Patent
Utility
US 5,413,047 · App. 08/137,681
Overburden removal method with blast casting and excavating apparatus
Inventors:
Randall N. Evans, Monica S. Cummins, Marlyn G. King, Robert Ferguson
Patented Case
View Patent ↗
Granted: May 9, 1995
Filed: Oct 15, 1993
Inventors
Randall N. Evans
Monica S. Cummins
Marlyn G. King
Robert Ferguson
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.