Granted Patent
Utility
US 4,609,653 · App. 06/565,867
Crystalline cephem-acid addition salts and processes for their preparation
Inventors:
Walter Durckheimer, Rudolf Lattrell
Patented Case
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Granted: Sep 2, 1986
Filed: Dec 27, 1983
Inventors
Walter Durckheimer
Rudolf Lattrell
Assignee (at issue)
Hoechst GmbH
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.