Granted Patent
Utility
US 4,449,794 · App. 06/324,989
Imaging optical system
Inventor:
Kenji Yamada
Patented Case
View Patent ↗
Granted: May 22, 1984
Filed: Nov 25, 1981
Inventor
Kenji Yamada
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.