Granted Patent
Utility
US 5,532,472 · App. 08/340,385
Photoelectric switch monitoring the duration of pulsed light to prevent false signals due to ambient conditions
Inventor:
Naofumi Furuta
Patented Case
View Patent ↗
Granted: Jul 2, 1996
Filed: Nov 15, 1994
Inventor
Naofumi Furuta
Assignee (at issue)
SUNX Limited
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.