Granted Patent
Utility
US 4,449,792 · App. 06/316,863
Large-aperture single lens with aspherical surfaces
Inventors:
Norikazu Arai, Shozo Ishiyama, Tadashi Kojima
Patented Case
View Patent ↗
Granted: May 22, 1984
Filed: Oct 30, 1981
Inventors
Norikazu Arai
Shozo Ishiyama
Tadashi Kojima
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
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.