Granted Patent
Utility
US 4,437,734 · App. 06/294,524
Lenses capable of close-up photography
Inventor:
Yutaka Iizuka
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Aug 20, 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.