Granted Patent
Utility
US 5,215,997 · App. 07/906,997
Synthesis of beta-lactam compounds
Inventors:
Ernst Hungerbuhler, Jaroslav Kalvoda
Patented Case
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Granted: Jun 1, 1993
Filed: Jul 1, 1992
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.