Granted Patent
Utility
US 5,589,906 · App. 08/516,556
Aperture device for a camera
Inventor:
Hitoshi Shimizu
Patented Case
View Patent ↗
Granted: Dec 31, 1996
Filed: Aug 18, 1995
Inventor
Hitoshi Shimizu
Assignee (at issue)
Asahi Kogaku Kogyo Kabushiki Kaisha
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.