Granted Patent
Utility
US 6,574,447 · App. 09/972,998
Laser beam emission control for electrophotographic device
Inventors:
Kazuyoshi Matsuo, Makoto Otaka
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Oct 10, 2001
Inventors
Kazuyoshi Matsuo
Makoto Otaka
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.