Granted Patent
Utility
US 4,198,518 · App. 05/937,023
Process for the production of 3-substituted pyrazolanthrones
Inventor:
Athanassios Tzikas
Patented Case
View Patent ↗
Granted: Apr 15, 1980
Filed: Aug 25, 1978
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.