Granted Patent
Utility
US 5,882,359 · App. 08/903,932
Vat dye mixtures, processes for their preparation and their use for dyeing cellulosic fibre materials
Inventors:
Peter Leupin, Roland Zoelper
Patented Case
View Patent ↗
Granted: Mar 16, 1999
Filed: Jul 31, 1997
Inventors
Peter Leupin
Roland Zoelper
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.