Granted Patent
Utility
US 4,612,014 · App. 06/782,596
Use of metal complexes of hydrazones as pigments
Inventor:
Franz Felix
Patented Case
View Patent ↗
Granted: Sep 16, 1986
Filed: Sep 30, 1985
Inventor
Franz Felix
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.