Granted Patent
Utility
US 4,448,719 · App. 06/274,910
Trifluoromethyl-substituted monoazo disperse dyes
Inventor:
Hansrudolf Schwander
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Jun 18, 1981
Inventor
Hansrudolf Schwander
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.