Granted Patent
Utility
US 5,502,236 · App. 08/405,682
Method for the production of (3-alkoxycarbonyl-2-butenyl)triphenylphosphonium salts
Inventors:
Bruno Burdet, August Ru/ ttimann, Jean-Marie Santer, Theodor Siegfried
Patented Case
View Patent ↗
Granted: Mar 26, 1996
Filed: Mar 17, 1995
Inventors
Bruno Burdet
August Ru/ ttimann
Jean-Marie Santer
Theodor Siegfried
Assignee (at issue)
HOFFMANN-LA ROCHE 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.