Granted Patent
Utility
US 4,925,947 · App. 06/843,839
Precursors to herbicidal pyridine compounds
Inventor:
David Cartwright
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Mar 26, 1986
Inventor
David Cartwright
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.