Granted Patent
Utility
US 4,809,042 · App. 07/067,015
Light beam scanning device and electronic photographic recording device using the same
Inventor:
Yoshifumi Homma
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Jun 29, 1987
Inventor
Yoshifumi Homma
Assignee (at issue)
HITACHI, 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.