US Patent Issued to Transitions Optical on Aug. 11 for "Indenonaphthopyrans having trialkylsilyl and ethylenically unsaturated groups" (Pennsylvania Inventors)

ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,703,712, issued on Aug. 11, was assigned to Transitions Optical Ltd. (Tuam, Ireland).

"Indenonaphthopyrans having trialkylsilyl and ethylenically unsaturated groups" was invented by Wenjing Xiao (Murrysville, Pa.), Beon-Kyu Kim (Gibsonia, Pa.) and Robert W. Walters (Murrysville, Pa.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to indenonaphthopyran compounds represented by the following Formula (I). With reference to Formula (I), R1 through R6 are as described in the specification. There is provided that the indenonaphthopyran compound represented by Formula (I) includes: (i) at least one trialkylsilyl group; and (ii) at ...