Granted Patent
Utility
US 4,264,178 · App. 06/105,781
Diaphragm device of a photographic lens
Inventor:
Takeshi Muryoi
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Dec 20, 1979
Inventor
Takeshi Muryoi
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.