Granted Patent
Utility
US 5,631,398 · App. 08/558,993
Method for the production of (3-alkoxycarbonyl-2-butenyl) triphenylphosphonium salts
Inventors:
Bruno Burdet, August R uttimann, Jean-Marie Santer, Theodor Siegfried
Patented Case
View Patent ↗
Granted: May 20, 1997
Filed: Nov 16, 1995
Inventors
Bruno Burdet
August R uttimann
Jean-Marie Santer
Theodor Siegfried
Assignee (at issue)
Roche Vitamins Inc.
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.