Granted Patent
Utility
US 4,243,600 · App. 06/033,405
Process for the manufacture of 1,4-diaminoanthraquinone-2-carboxylic acid
Inventor:
Athanassios Tzikas
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Apr 26, 1979
Inventor
Athanassios Tzikas
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.