Granted Patent
Utility
US 4,288,364 · App. 06/039,239
Fragmentation procedure for preparing 3-amino-azetidinones
Inventors:
Karl Schaffner, Hansuli Wehrli, Beat Muller, Riccardo Scartazzini
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: May 15, 1979
Inventors
Karl Schaffner
Hansuli Wehrli
Beat Muller
Riccardo Scartazzini
Assignee (at issue)
Ciba-Geigy
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.