Granted Patent
Utility
US 4,680,417 · App. 06/792,645
2.6-dioxo-2.6-dehydrobenzo[1:2-b,4:5-b]difurans
Inventors:
Ronald W. Kenyon, Derek Thorp
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Oct 29, 1985
Inventors
Ronald W. Kenyon
Derek Thorp
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.