Granted Patent
Utility
US 4,401,345 · App. 06/370,607
Hydraulic borehole mining system
Inventor:
William R. Archibald
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Apr 22, 1982
Inventor
William R. Archibald
Assignee (at issue)
Flow Industries, Ltd.
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.