Granted Patent
Utility
US 4,934,772 · App. 07/279,096
Light beam scanning lens and light beam scanning device
Inventors:
Nobuo Sakuma, Katsumi Yamaguchi
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Dec 2, 1988
Inventors
Nobuo Sakuma
Katsumi Yamaguchi
Assignee (at issue)
RICOH COMPANY, LTD.
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.