Granted Patent
Utility
US 6,171,572 · App. 09/331,821
Method for preparing a zirconium-cerium composite oxide
Inventor:
Shigeru Aozasa
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Jun 22, 1999
Inventor
Shigeru Aozasa
Assignee (at issue)
ANAN KASEI CO., LTD.
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.