Granted Patent
Utility
US 4,379,149 · App. 06/304,457
Process for introducing an oxygen-containing functional group into ansamycins
Inventor:
Wilhelm Kump
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Sep 22, 1981
Inventor
Wilhelm Kump
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.