Granted Patent
Utility
US 6,631,763 · App. 09/937,795
Method and system for testing a borehole by the use of a movable plug
Inventors:
John Self, Rolf Dirdal
Patented Case
View Patent ↗
Granted: Oct 14, 2003
Filed: Feb 5, 2002
Inventors
John Self
Rolf Dirdal
Assignee (at issue)
Den Norske Stats Oljeselskap A.S.
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.