Granted Patent
Utility
US 4,386,833 · App. 06/272,760
Epi-illumination type projection device
Inventor:
Hideo Hirose
Patented Case
View Patent ↗
Granted: Jun 7, 1983
Filed: Jun 11, 1981
Inventor
Hideo Hirose
Assignee (at issue)
Nippon Kogaku K.K.
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.