Granted Patent
Utility
US 4,243,304 · App. 06/016,456
Convergence mechanism for binocular refracting instrument
Inventor:
Rato R. Buhler
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Feb 28, 1979
Inventor
Rato R. Buhler
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.