Granted Patent
Utility
US 5,053,055 · App. 07/275,236
Whitener dispersion
Inventors:
Werner Fringeli, Martin Jollenbeck
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Nov 22, 1988
Inventors
Werner Fringeli
Martin Jollenbeck
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.