Granted Patent
Utility
US 4,237,281 · App. 06/014,780
Dyestuffs containing amino or imino groups
Inventor:
William E. Long
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Feb 23, 1979
Inventor
William E. Long
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.