Granted Patent
Utility
US 6,168,636 · App. 09/434,902
Dye mixtures of fiber-reactive azo dyes and their use
Inventors:
Bengt-Thomas Grobel, Christian Schumacher, Birgit Eden, Mieke Schaffeld, Karl Krieger, Dierk Rohrig
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Nov 5, 1999
Inventors
Bengt-Thomas Grobel
Christian Schumacher
Birgit Eden
Mieke Schaffeld
Karl Krieger
Dierk Rohrig
Assignee (at issue)
DyStar Textilfarben GmbH & Co. Deutschland KG
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.