Granted Patent
Utility
US 6,508,290 · App. 09/945,481
Method of preparing an aluminum-containing iron oxide nucleus
Inventor:
Ulrich Meisen
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: Aug 31, 2001
Inventor
Ulrich Meisen
Assignee (at issue)
Bayer Aktiengesellschaft
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.