Granted Patent
Utility
US 5,433,931 · App. 08/026,502
Recovery of cerium
Inventor:
Paula J. Bosserman
Patented Case
View Patent ↗
Granted: Jul 18, 1995
Filed: Mar 4, 1993
Inventor
Paula J. Bosserman
Assignee (at issue)
Union Oil Company of California
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.