How do I obtain a complete file history of a patent?

A file history of a patent or a published application for patent may also be obtained in person through the File Information Unit (FIU). The FIU is on the third floor of the Randolph Square Building, 2800 S. Randolph St., Arlington, Virginia. You may contact the FIU through their direct line at 703-756-1100.

USPTO FAQ - Questions and Answers (04OCT2004)