Granted Patent
Utility
US 5,698,705 · App. 08/475,964
Isoindoline pigments
Inventors:
Frank Alfter, Erwin Dietz, Gustav Kapaun, Siegfried Schiessler
Patented Case
View Patent ↗
Granted: Dec 16, 1997
Filed: Jun 7, 1995
Inventors
Frank Alfter
Erwin Dietz
Gustav Kapaun
Siegfried Schiessler
Assignee (at issue)
Hoechst GmbH
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.