Granted Patent
Utility
US 4,447,717 · App. 06/343,986
Automatic focusing device in a stereoscopic microscope
Inventor:
Masao Nohda
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Jan 29, 1982
Inventor
Masao Nohda
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.