Granted Patent
Utility
US 5,164,005 · App. 07/853,886
Black manganese/iron oxide pigment a process for its production and its use
Inventors:
Peter Kuske, Gunter Buxbaum
Patented Case
View Patent ↗
Granted: Nov 17, 1992
Filed: Mar 18, 1992
Inventors
Peter Kuske
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.