US' UltraStrip Systems, the developer of robotic ship hull cleaning equipment, has announced that it has received from the U.S. Patent and Trademark Office patent number US 6,564,815 titled "Air Gap Magnetic Mobile Robot". The new patent allows UltraStrip Systems to further expand its patented coatings removal systems. The advantages to the Air Gap patent over existing UltraStrip patented roller designs are greater adhesion and non-marring of the surface. President and CEO Dr. Robert O. Baratta said, "UltraStrip's latest patent, in our opinion, gives even greater patent protection for our M3500 Robotic System than we had with our earlier patents. UltraStrip Systems has received four other U.S.