Granted Patent
Utility
US 4,679,921 · App. 06/736,072
Apparatus for eye examination
Inventor:
Kenji Yamada
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: May 20, 1985
Inventor
Kenji Yamada
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.