Granted Patent
Utility
US 6,374,844 · App. 09/637,967
Method in operating a cavern for gas
Inventor:
Ola Hall
Patented Case
View Patent ↗
Granted: Apr 23, 2002
Filed: Aug 11, 2000
Inventor
Ola Hall
Assignees (at issue)
Gaz de France
Sydkraft AB
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.