Granted Patent
Utility
US 4,910,018 · App. 07/244,182
N-benzoyl-N'-2,4-difluoro-3,5-dihalophenylureas, their preparation and use in pest control
Inventor:
Jozef Drabek
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Sep 14, 1988
Inventor
Jozef Drabek
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.