Granted Patent
Utility
US 4,384,135 · App. 06/226,023
Preparation of fluorine-containing diphenyl ethers
Inventors:
David Cartwright, Roger Salmon, Alfred Glyn Williams
Patented Case
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Granted: May 17, 1983
Filed: Jan 19, 1981
Inventors
David Cartwright
Roger Salmon
Alfred Glyn Williams
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.