Granted Patent
Utility
US 4,439,031 · App. 06/413,777
Diaphragm driving device for a lens barrel
Inventor:
Takeshi Muryoi
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Sep 1, 1982
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.