US Patent 7401992 Writing instrument

A writing instrument has a barrel, a connector and a clip. The barrel has a front end, a rear end and a writing tip. The writing tip is mounted on the first end. The connector is mounted on the barrel. The clip attaches to the connector and has an inner surface, an outer surface, a proximal end, a distal end, a cavity, memory and an input and output (I/O) interface. The memory is mounted in the cavity and stores data. The I/O interface is connected electronically to the memory and protrudes from the distal end of the connector. A user can bring the writing instrument to write or store date in the memory. Therefore, storing date and writing is combined in a small volume in the writing instrument.