Granted Patent
Utility
US 6,730,795 · App. 09/995,328
Process for the preparation of phenylene-bis-benzimidazole-tetrasulfonic acid disodium salt
Inventors:
Ralf Bertram, Stephan Hillers, Oskar Koch, Harry Erfurt, Gerald Reinders
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Nov 27, 2001
Inventors
Ralf Bertram
Stephan Hillers
Oskar Koch
Harry Erfurt
Gerald Reinders
Assignee (at issue)
Symrise GmbH & Co. KG
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.