Granted Patent
Utility
US 4,968,720 · App. 07/231,749
Phenylcarbodiimides, compositions containing them and their use in the control of pests
Inventor:
Josef Ehrenfreund
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Aug 12, 1988
Inventor
Josef Ehrenfreund
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.