Granted Patent
Utility
US 6,453,939 · App. 08/886,708
Flotation cell fluid level control apparatus
Inventors:
Robert D. Cook, Jerry W. Hunt
Patented Case
View Patent ↗
Granted: Sep 24, 2002
Filed: Jul 1, 1997
Inventors
Robert D. Cook
Jerry W. Hunt
Assignee (at issue)
Baker Hughes Holdings LLC
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.