Granted Patent
Utility
US 5,939,713 · App. 08/963,478
Optical sensing system using two sensors to generate position signals
Inventor:
Shu-Ming Liu
Patented Case
View Patent ↗
Granted: Aug 17, 1999
Filed: Nov 3, 1997
Inventor
Shu-Ming Liu
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.