Granted Patent
Utility
US 4,423,220 · App. 06/097,592
Process for the production of O,O-dialkylphosphorodithioates
Inventors:
Jean-Pierre Ledouble, Markus Tschopp
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Nov 26, 1979
Inventors
Jean-Pierre Ledouble
Markus Tschopp
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.