Granted Patent
Utility
US 5,991,249 · App. 08/902,398
Optical track sensing device
Inventor:
Wai-Hon Lee
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Jul 29, 1997
Inventor
Wai-Hon Lee
Assignee (at issue)
Hoetron, 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.