Granted Patent
Utility
US 4,287,347 · App. 06/148,849
Process for producing 2,3,5-trichloropyridine
Inventors:
Hansjakob Fah, Alfred Grieder
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: May 12, 1980
Inventors
Hansjakob Fah
Alfred Grieder
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.