Granted Patent
Utility
US 4,236,793 · App. 05/945,168
Ophthalmic refracting device
Inventors:
Donald B. Whitney, Bernard Grolman, William D. Richards
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Sep 25, 1978
Inventors
Donald B. Whitney
Bernard Grolman
William D. Richards
Assignee (at issue)
American Optical 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.