Granted Patent
Utility
US 4,472,308 · App. 06/160,427
Azo dyestuffs containing an amino or acylated amino naphthol monosulfonic acid radical and at least one reactive phosphoric or phosphonic acid group
Inventor:
Donald R. Gauthier, Jr.
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jun 17, 1980
Inventor
Donald R. Gauthier, Jr.
Assignee (at issue)
ICI United States, Inc.
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.