Granted Patent
Utility
US 4,562,249 · App. 06/707,548
Bis(4-((chloro substituted phenyl)azo)anilino methylenes
Inventors:
Hansrudolf Schwander, Rudolf Hurter
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: Mar 5, 1985
Inventors
Hansrudolf Schwander
Rudolf Hurter
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.