Granted Patent
Utility
US 4,281,890 · App. 06/023,316
Optical adjustment knob for binocular
Inventor:
Gerrit A. Van Exel
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Mar 23, 1979
Inventor
Gerrit A. Van Exel
Assignee (at issue)
BAUSCH & LOMB INCORPORATED
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.