Granted Patent
Utility
US 5,265,941 · App. 07/932,776
Underground mining system and method for developing longwall panel
Inventor:
Larry G. Marteney
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Aug 20, 1992
Inventor
Larry G. Marteney
Assignee (at issue)
Tamrock World Corporation, N.V.
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.