Granted Patent
Utility
US 6,414,192 · App. 10/007,014
Process for preparing 4-aminodiphenylamine
Inventors:
Michael Schelhaas, Carl Casser, Dietmar Bielefeldt, Pieter Ooms, Joachim Haider, Manfred Jautelat, Christian Laue, Henry Giera
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Nov 6, 2001
Inventors
Michael Schelhaas
Carl Casser
Dietmar Bielefeldt
Pieter Ooms
Joachim Haider
Manfred Jautelat
Christian Laue
Henry Giera
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.