Granted Patent
Utility
US 4,971,981 · App. 07/145,432
Substituted dioxolan and dioxan derivatives useful as pesticides
Inventor:
Friedrich Karrer
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Jan 19, 1988
Inventor
Friedrich Karrer
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.