Granted Patent
Utility
US 5,646,271 · App. 08/459,436
Bleaching auxiliary
Inventors:
Albert Stehlin, Klaus Huber, Thomas Maier
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Jun 2, 1995
Inventors
Albert Stehlin
Klaus Huber
Thomas Maier
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.