Granted Patent
Utility
US 5,877,325 · App. 08/881,661
Quaternary ammonium compounds as bleach activators and their preparation
Inventors:
Matthias Loffler, Gerd Reinhardt
Patented Case
View Patent ↗
Granted: Mar 2, 1999
Filed: Jun 24, 1997
Inventors
Matthias Loffler
Gerd Reinhardt
Assignee (at issue)
Hoechst GmbH
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.