Granted Patent
Utility
US 4,704,339 · App. 06/818,496
Infra-red transparent optical components
Inventors:
Geoffrey W. Green, Alan H. Lettington
Patented Case
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Granted: Nov 3, 1987
Filed: Jan 13, 1986
Inventors
Geoffrey W. Green
Alan H. Lettington
Assignee (at issue)
The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
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.