Granted Patent
Utility
US 5,739,952 · App. 08/421,904
Polarizing beam splitter and optical head assembly
Inventors:
Tadashi Takeda, Yoshio Hayashi, Hideo Takezoe, Ken Ishikawa
Patented Case
View Patent ↗
Granted: Apr 14, 1998
Filed: Apr 14, 1995
Inventors
Tadashi Takeda
Yoshio Hayashi
Hideo Takezoe
Ken Ishikawa
Assignee (at issue)
Kabushiki Kaisha Sankyo Seiki Seisakusho
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.