Granted Patent
Utility
US 5,641,027 · App. 08/370,440
Drilling system
Inventor:
Eugene L. Foster
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: Jan 9, 1995
Inventor
Eugene L. Foster
Assignee (at issue)
UTD Incorporated
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.