Granted Patent
Utility
US 4,950,306 · App. 07/386,529
Dyeing and printing of cellulosic fibre materials with vat dyes with mono- or di-hydroxyacetone as reducing agent
Inventors:
Walter Marte, Paul Rys
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Jul 27, 1989
Inventors
Walter Marte
Paul Rys
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.