Granted Patent
Utility
US 5,011,996 · App. 07/375,762
Process for the preparation of amines
Inventors:
Wolfgang Kiel, Heinz Ziemann
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Jul 5, 1989
Inventors
Wolfgang Kiel
Heinz Ziemann
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.