Granted Patent
Utility
US 5,971,085 · App. 08/965,334
Downhole unit for use in boreholes in a subsurface formation
Inventor:
Mark Colebrook
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Nov 6, 1997
Inventor
Mark Colebrook
Assignee (at issue)
Camco International (UK) Limited
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.