Granted Patent
Utility
US 4,468,097 · App. 06/421,421
Four-group great aperture ratio zoom lens
Inventor:
Yoshinari Hamanishi
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Sep 22, 1982
Inventor
Yoshinari Hamanishi
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.