Granted Patent
Utility
US 5,883,718 · App. 08/984,446
Optical sensing system for detecting displacements of a slidable frame along an elongated plate
Inventor:
Liu Shu-Ming
Patented Case
View Patent ↗
Granted: Mar 16, 1999
Filed: Dec 3, 1997
Inventor
Liu Shu-Ming
Assignee (at issue)
Primax Electronics Ltd.
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.