Granted Patent
Utility
US 4,640,373 · App. 06/703,069
Bore head for deep-hole boring
Inventor:
Wilfried Horsch
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Feb 19, 1985
Inventor
Wilfried Horsch
Assignee (at issue)
GTE Products 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.