VALENCIA, Calif.--April 29, 2002--3D Systems Corp. today announced it has entered into an exclusive license agreement, including enforcement rights, with Richard Helinski of Narragansett, R.I., fundamental to dispensing multiple solidifiable materials from an inkjet print head to form three-dimensional objects. The license of U.S. Patent No. 5,136,515 grants 3D Systems the right to sue for past, present and future patent infringement and recover profits and damages, as appropriate. The patent also pertains to the use of "radiation curable" material dispensed from a print head to form three-dimensional objects. "These licensed patent rights are a valuable addition to 3D Systems' portfolio of intellectual property," said Chuck Hull, chief technology officer. "They allow us to improve our technology and further enhance our development of the multi-jet modeling (MJM) product line. We look forward to announcing more advancements in this area in the near future." Helinski was active in the early development work relating to phase-change color inkjet printing technology while at Howtek Inc. of Hudson, N.H., and holds eight U.S. patents.