Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus

Takaura , et al. October 6, 2

Patent Grant RE45728

U.S. patent number RE45,728 [Application Number 13/973,783] was granted by the patent office on 2015-10-06 for projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus. This patent grant is currently assigned to RICOH COMPANY, LTD.. The grantee listed for this patent is Kazuhiro Fujita, Nobuo Sakuma, Atsushi Takaura. Invention is credited to Kazuhiro Fujita, Nobuo Sakuma, Atsushi Takaura.


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