Granted Patent
Utility
US 4,246,016 · App. 06/017,986
Method of making graded refractive index fibers and rods
Inventor:
Walter P. Siegmund
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Mar 7, 1979
Inventor
Walter P. Siegmund
Assignee (at issue)
American Optical 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.