Granted Patent
Utility
US 5,490,994 · App. 08/281,392
Method of stabilizing the color of the disodium salt of 5,5'-indigotin disulfonic acid
Inventor:
Helena S. Soedjak
Patented Case
View Patent ↗
Granted: Feb 13, 1996
Filed: Jul 27, 1994
Inventor
Helena S. Soedjak
Assignee (at issue)
KRAFT FOODS HOLDINGS, 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.