Granted Patent
Utility
US 4,398,807 · App. 06/235,086
Zoom lens
Inventor:
Yutaka Iizuka
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Feb 17, 1981
Inventor
Yutaka Iizuka
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.