Granted Patent
Utility
US 4,944,303 · App. 07/137,611
Noncontact type tonometer
Inventor:
Kenjiro Katsuragi
Patented Case
View Patent ↗
Granted: Jul 31, 1990
Filed: Dec 24, 1987
Inventor
Kenjiro Katsuragi
Assignee (at issue)
TOPCON CORPORATION
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.