Granted Patent
Utility
US 4,259,495 · App. 06/074,217
Process for producing 2,3,5,6-tetrachloropyridine
Inventor:
Claus D. Weis
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Sep 10, 1979
Inventor
Claus D. Weis
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.