Granted Patent
Utility
US 4,744,648 · App. 06/866,247
Eye refractive power measuring apparatus
Inventors:
Yasuo Kato, Yasufumi Fukuma, Kiwami Horiguchi, Kiichi Kamiyama
Patented Case
View Patent ↗
Granted: May 17, 1988
Filed: May 23, 1986
Inventors
Yasuo Kato
Yasufumi Fukuma
Kiwami Horiguchi
Kiichi Kamiyama
Assignee (at issue)
Tokyo Kogaku Kikai 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.