Granted Patent
Utility
US 5,925,791 · App. 09/031,964
Process for producing 4-aminodiphenylamine
Inventors:
Hans-Josef Buysch, Christian Laue, Heinrich Konigshofen, Ulrich Notheis, Pieter Ooms, Ursula Pentling
Patented Case
View Patent ↗
Granted: Jul 20, 1999
Filed: Feb 27, 1998
Inventors
Hans-Josef Buysch
Christian Laue
Heinrich Konigshofen
Ulrich Notheis
Pieter Ooms
Ursula Pentling
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.