http://www.patentstorm.us/patents/7444005/description.html
US Patent 7444005 - Apparatus and method for using optical mouse  
engine to determine speed, direction, position of scanned device and  
to obtain quantitative or qualitative data from same

US Patent Issued on October 28, 2008
Estimated Patent Expiration Date:  November 4, 2023

Gus
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