Granted Patent
Utility
US 5,069,283 · App. 07/388,672
Fracturing process using carbon dioxide and nitrogen
Inventor:
David Mack
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Aug 2, 1989
Inventor
David Mack
Assignee (at issue)
Western Company of North America
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.