Granted Patent
Utility
US 5,218,095 · App. 07/656,270
Phthalimidylazo dyes
Inventor:
Martin Trottmann
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Feb 15, 1991
Inventor
Martin Trottmann
Assignee (at issue)
Ciba-Geigy
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.