Granted Patent
Utility
US 6,344,643 · App. 09/421,565
Encoder wheel module and circuit board arrangement for an optical mouse with scrolling function
Inventor:
Cheng-Hsiung Chen
Patented Case
View Patent ↗
Granted: Feb 5, 2002
Filed: Oct 20, 1999
Inventor
Cheng-Hsiung Chen
Assignee (at issue)
DEXIN CORP.
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.