Granted Patent
Utility
US 4,817,620 · App. 07/092,536
Noncontact type tonometer
Inventors:
Kenjiro Katsuragi, Katsuhiko Kobayashi, Yoshitaka Torii
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Sep 3, 1987
Inventors
Kenjiro Katsuragi
Katsuhiko Kobayashi
Yoshitaka Torii
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.