Granted Patent
Utility
US 4,336,026 · App. 06/226,573
Liquid preparation of an anionic dye of the disazo class
Inventor:
Roger Lacroix
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Jan 19, 1981
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.