Granted Patent
Utility
US 4,833,494 · App. 07/167,148
Single lens reflex camera having replaceable view finder
Inventor:
Keiji Ohsawa
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Mar 11, 1988
Inventor
Keiji Ohsawa
Assignee (at issue)
NIKON 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.