Granted Patent
Utility
US 6,328,113 · App. 09/440,338
Isolation of subterranean zones
Inventor:
Robert Lance Cook
Patented Case
View Patent ↗
Granted: Dec 11, 2001
Filed: Nov 15, 1999
Inventor
Robert Lance Cook
Assignee (at issue)
SHELL OIL 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.