Granted Patent
Utility
US 4,424,173 · App. 06/363,988
Process for producing O,O-diesters of thiophosphorus acid
Inventor:
Horst Zinke
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Mar 31, 1982
Inventor
Horst Zinke
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.