Granted Patent
Utility
US 5,280,128 · App. 07/805,897
Process for the preparation of benzothioxanthene dyestuffs
Inventors:
Wolfgang Bauer, Eberhard Grimm, Uwe Nickel, Manfred Schrod, Herbert Wille
Patented Case
View Patent ↗
Granted: Jan 18, 1994
Filed: Dec 12, 1991
Inventors
Wolfgang Bauer
Eberhard Grimm
Uwe Nickel
Manfred Schrod
Herbert Wille
Assignee (at issue)
Cassella 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.