Granted Patent
Utility
US 4,864,868 · App. 07/129,123
Vortex flowmeter transducer
Inventor:
Mohamed Khalifa
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Dec 4, 1987
Inventor
Mohamed Khalifa
Assignee (at issue)
Schlumberger Industires, S.A.
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.