Granted Patent
Utility
US 4,400,063 · App. 06/271,284
F(.theta.) Lens system of four-group construction
Inventor:
Bun Hayashida
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Jun 8, 1981
Inventor
Bun Hayashida
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.