Granted Patent
Utility
US 6,534,032 · App. 09/798,847
Process for the production of yellow iron oxide
Inventor:
Ulrich Meisen
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Mar 2, 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.