Source Translation & Optimization (STO) Internet Patent Search System

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http://sunsite.unc.edu/patents/intropat.html

Searchable by either class/subclass code or patent number. Provides a browsable list of the U.S. Patent and Trademark Office (PTO) classification system to determine the class/subclass code. Search returns patent number, title, and year of issue for all patents that meet the search criteria.