Granted Patent
Utility
US 4,912,121 · App. 07/060,865
Heterocyclic compounds and their use as pesticides
Inventors:
Paul A. Worthington, Margaret C. Shephard
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Jun 12, 1987
Inventors
Paul A. Worthington
Margaret C. Shephard
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.