Granted Patent
Utility
US 6,767,448 · App. 10/049,728
Method for producing aqueous alkaline solutions or reduced indigoid dyes
Inventors:
Thomas Bechtold, Rudolf Kruger, Hans-Peter Maier, Georg Schnitzer, Franz Sütsch, Wolfgang Schrott, Norbert Grund
Patented Case
View Patent ↗
Granted: Jul 27, 2004
Filed: Oct 25, 2001
Inventors
Thomas Bechtold
Rudolf Kruger
Hans-Peter Maier
Georg Schnitzer
Franz Sütsch
Wolfgang Schrott
Norbert Grund
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.