Granted Patent
Utility
US 6,435,619 · App. 09/471,122
Method for sensing coal-rock interface
Inventors:
Larry D. Frederick, Dwight Medley
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Dec 23, 1999
Inventors
Larry D. Frederick
Dwight Medley
Assignee (at issue)
Geosteering Mining Services, LLC
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.