Granted Patent
Utility
US 4,421,985 · App. 06/279,151
Dark field infrared telescope
Inventors:
James D. Billingsley, Dayton D. Eden
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Jun 30, 1981
Inventors
James D. Billingsley
Dayton D. Eden
Assignee (at issue)
Vought Corporation
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.