Granted Patent
Utility
US 5,064,570 · App. 07/469,704
Dispersion fluorescent brightener preparations
Inventor:
Peter Rohringer
Patented Case
View Patent ↗
Granted: Nov 12, 1991
Filed: Jan 24, 1990
Inventor
Peter Rohringer
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.