Granted Patent
Utility
US 5,000,756 · App. 07/444,468
Process for dyeing cellulosic fibre materials with reactive phthalocyanine dyes from bath containing colorless compounds
Inventor:
Peter Aeschlimann
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Dec 1, 1989
Inventor
Peter Aeschlimann
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.