Granted Patent
Utility
US 5,944,101 · App. 09/094,879
Apparatus for milling a window in well tubular
Inventor:
David D. Hearn
Patented Case
View Patent ↗
Granted: Aug 31, 1999
Filed: Jun 15, 1998
Inventor
David D. Hearn
Assignee (at issue)
Atlantic Richfield 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.