Granted Patent
Utility
US 4,995,885 · App. 07/434,157
Concentrated aqueous dye solutions for dyeing paper
Inventor:
Hans Morawietz
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Nov 13, 1989
Inventor
Hans Morawietz
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.