Granted Patent
Utility
US 5,667,759 · App. 08/690,420
Method for manufacturing alkali chromates from chromium ore
Inventors:
Rainer Bellinghausen, Heinrich Helker, Paul Strehlow, Hans-Heinrich Moretto, Bernhard Spreckelmeyer, Norbert Lonhoff, Michael Batz, Rainer Weber, Hans Rinkes, Hans-Dieter Block, Uwe Arndt
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Jul 26, 1996
Inventors
Rainer Bellinghausen
Heinrich Helker
Paul Strehlow
Hans-Heinrich Moretto
Bernhard Spreckelmeyer
Norbert Lonhoff
Michael Batz
Rainer Weber
Hans Rinkes
Hans-Dieter Block
Uwe Arndt
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.