Granted Patent
Utility
US 5,475,209 · App. 08/318,548
Displacement measurement apparatus having first and second servo control circuits and a zone decision circuit
Inventor:
Nobuo Nabeshima
Patented Case
View Patent ↗
Granted: Dec 12, 1995
Filed: Oct 5, 1994
Inventor
Nobuo Nabeshima
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.