Granted Patent
Utility
US 4,647,401 · App. 06/678,424
Process for preparing colloidal ceric oxide and complexes thereof with free organic acids
Inventors:
Peter S. Gradeff, Fred G. Schreiber, Vincent J. Charte, John F. Davison
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Dec 5, 1984
Inventors
Peter S. Gradeff
Fred G. Schreiber
Vincent J. Charte
John F. Davison
Assignee (at issue)
Rhone-Poulenc, 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.