Granted Patent
Utility
US 5,622,232 · App. 08/270,959
Blasthole drill with drill-through pipe rack
Inventor:
H. Dewain Whisenhunt
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: Jul 5, 1994
Inventor
H. Dewain Whisenhunt
Assignee (at issue)
Harnischfeger Corporation
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.