ATLANTA--May 21, 2003-- T/R SYSTEMS, INC., a leader in developing innovative solutions for the management and production of digital documents, announced today that the United States patent office has allowed two additional patents regarding its cluster printing technology. These patents, one addressing a method and apparatus for routing pages to printers as a function of page characteristics and the other regarding color calibration, pertain to some of the core concepts of T/R Systems' clustering technologies, including color splitting, intelligent document routing and color calibration. "We believe these are very important patents for T/R Systems as they will add significant breadth and depth to our intellectual property portfolio," said Neal Tompkins, Chief Technology Officer of T/R Systems. "These patents represent a critical step forward in protecting and reinforcing the value of the technologies that we have pioneered." T/R Systems currently holds 16 U.S. patents, including these most recent allowances, with 15 additional patent applications pending in the U.S. and abroad.