Granted Patent
Utility
US 6,312,583 · App. 09/486,708
Process for reducing sulphide dyestuffs
Inventors:
Thomas Bechtold, Eduard Burtscher
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Mar 6, 2000
Inventors
Thomas Bechtold
Eduard Burtscher
Assignee (at issue)
BASF SE
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.