Granted Patent
Utility
US 4,396,256 · App. 06/291,710
Large aperture ratio, long focus lens
Inventor:
Daijiro Fujie
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Aug 10, 1981
Inventor
Daijiro Fujie
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.