Granted Patent
Utility
US 6,407,029 · App. 09/617,470
Mixtures comprising tetrakis(pyrrolidino/piperdino)phosphonium salts
Inventors:
Berthold Schiemenz, Thomas Wessel, Ralf Pfirmann, Andreas Beck, Walter Hahn
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Jul 17, 2000
Inventors
Berthold Schiemenz
Thomas Wessel
Ralf Pfirmann
Andreas Beck
Walter Hahn
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.