Granted Patent
Utility
US 4,298,262 · App. 06/181,978
Aperture device of a lens capable of close proximity flash photography
Inventors:
Hideyo Nozawa, Hideshi Naito
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Aug 28, 1980
Inventors
Hideyo Nozawa
Hideshi Naito
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.