Granted Patent
Utility
US 6,465,643 · App. 09/617,471
Aminophosphonium compounds
Inventors:
Berthold Schiemenz, Thomas Wessel, Ralf Pfirmann
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: Jul 17, 2000
Inventors
Berthold Schiemenz
Thomas Wessel
Ralf Pfirmann
Assignee (at issue)
Clariant Corporation
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.