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commemorative coin Paul Tumarkin/Tech Launch Arizona TLA presents UArizona inventors with a coin for each patent issued. This year's coins will be presented in April at an event commemorating World Intellectual Property Day. This coin was printed for Dong-Chul Pyun, a professor of chemistry and biochemistry, who co-invented, with Ruongguang Liang, a novel method for 3D printing ultra-high refractive index optical polymers. The materials are of interest for use in lightweight, inexpensive lenses and other optical components and devices.