Granted Patent
Utility
US 5,637,868 · App. 08/412,951
Fixed point detecting device using detection of light diffracted by holographic diffraction gratings
Inventor:
Hideaki Tamiya
Patented Case
View Patent ↗
Granted: Jun 10, 1997
Filed: Mar 29, 1995
Inventor
Hideaki Tamiya
Assignee (at issue)
Sony Magnescale Inc.
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.