Granted Patent
Utility
US 4,375,312 · App. 06/175,998
Graded index waveguide structure and process for forming same
Inventor:
Gregory L. Tangonan
Patented Case
View Patent ↗
Granted: Mar 1, 1983
Filed: Aug 7, 1980
Inventor
Gregory L. Tangonan
Assignee (at issue)
Hughes Aircraft Company
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.