Granted Patent
Utility
US 4,260,391 · App. 06/016,682
Stable concentrated solution of a dye of the disazo class
Inventor:
Roger Lacroix
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: Mar 1, 1979
Inventor
Roger Lacroix
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.