Granted Patent
Utility
US 5,504,254 · App. 08/361,383
Process for the preparation of isophoronediamine
Inventors:
Thomas Haas, Dietrich Arntz, Dieter Most
Patented Case
View Patent ↗
Granted: Apr 2, 1996
Filed: Dec 22, 1994
Inventors
Thomas Haas
Dietrich Arntz
Dieter Most
Assignee (at issue)
Degussa AG
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.