Granted Patent
Utility
US 5,667,579 · App. 08/658,311
Thermally stable iron oxide pigments, a process for their preparation and their use
Inventors:
Wolfgang Oehlert, Friedrich Jonas, Gunter Buxbaum
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Jun 5, 1996
Inventors
Wolfgang Oehlert
Friedrich Jonas
Gunter Buxbaum
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.