Granted Patent
Utility
US 4,894,380 · App. 07/176,483
2-mercapto-5-pyridyl-1,3,4-oxadiazoles and 2-mercapto-5-pyridyl-1,3,4-thiadiazoles of the formula I
Inventors:
Robert Nyfeler, Wolfgang Eckhardt, Ernst Beriger, Odd Kristiansen
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Mar 25, 1988
Inventors
Robert Nyfeler
Wolfgang Eckhardt
Ernst Beriger
Odd Kristiansen
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.