Granted Patent
Utility
US 4,248,773 · App. 05/964,548
Acetoacetamide diazo dyestuffs
Inventors:
Rudolf Hurter, Alfred Fasciati
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Nov 29, 1978
Inventors
Rudolf Hurter
Alfred Fasciati
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.