Granted Patent
Utility
US 4,605,076 · App. 06/637,396
Method for forming boreholes
Inventor:
Milton E. Goodhart
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Aug 3, 1984
Inventor
Milton E. Goodhart
Assignee (at issue)
Hydril Company
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.