Granted Patent
Utility
US 4,539,409 · App. 06/542,965
Process for preparing aromatic nitriles
Inventors:
Dietrich Arntz, Gunter Prescher, Werner Burkhardt, Johannes Heilos, Reinhard Manner
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Oct 18, 1983
Inventors
Dietrich Arntz
Gunter Prescher
Werner Burkhardt
Johannes Heilos
Reinhard Manner
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.