Granted Patent
Utility
US 5,482,514 · App. 08/119,463
Process for enhancing the whiteness, brightness and chormaticity of paper making fibres
Inventor:
Axel von Raven
Patented Case
View Patent ↗
Granted: Jan 9, 1996
Filed: Sep 9, 1993
Inventor
Axel von Raven
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.