Granted Patent
Utility
US 5,454,917 · App. 08/116,839
Apparatus and process for recovering metal from an aqueous solution
Inventors:
Phillip L. Mattison, William E. Friestad, John Fast
Patented Case
View Patent ↗
Granted: Oct 3, 1995
Filed: Sep 3, 1993
Inventors
Phillip L. Mattison
William E. Friestad
John Fast
Assignee (at issue)
Cognis Corporation
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.