Granted Patent
Utility
US 4,639,094 · App. 06/536,371
Gradient index lens system
Inventor:
Yasuhiro Aono
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Sep 27, 1983
Inventor
Yasuhiro Aono
Assignee (at issue)
Nippon Kogaku K.K.
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.