Granted Patent
Utility
US 4,962,196 · App. 07/331,072
(3S, 4R)-3,4-trans-disubstituted azetidin-2-one intermediates
Inventors:
Ernst Hungerbuhler, Jaroslav Kalvoda
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Mar 24, 1989
Inventors
Ernst Hungerbuhler
Jaroslav Kalvoda
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.