Granted Patent
Utility
US 5,792,879 · App. 08/864,720
Preparation of DI-OR triarylmethane dyes by oxidation
Inventors:
Thomas Gessner, Udo Mayer
Patented Case
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Granted: Aug 11, 1998
Filed: May 28, 1997
Inventors
Thomas Gessner
Udo Mayer
Assignee (at issue)
BASF SE
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.