Granted Patent
Utility
US 4,797,189 · App. 07/131,759
Pressure balanced sealing pistons for cathodes in an electrolyte chamber
Inventors:
Edmund R. Hinman, Richard A. Jack
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Dec 11, 1987
Inventors
Edmund R. Hinman
Richard A. Jack
Assignee (at issue)
Airfoil Textron Inc.
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.