Granted Patent
Utility
US 5,057,562 · App. 07/363,649
Process for the photochemical stabilization of undyed and dyed polypropylene fibres
Inventor:
Gerhard Reinert
Patented Case
View Patent ↗
Granted: Oct 15, 1991
Filed: Jun 8, 1989
Inventor
Gerhard Reinert
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.