US Patent Issued to Essilor International on June 2 for "Method of producing an optical material and optical material" (Chinese, Thai Inventors)

ALEXANDRIA, Va., June 2 -- United States Patent no. 12,645,012, issued on June 2, was assigned to Essilor International (Charenton-le-pont, France).

"Method of producing an optical material and optical material" was invented by Jianwei Zhang (Shanghai) and Laurent Chippaux (Bangkok).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of producing an optical material, wherein a polymerizable composition intended to polymerize to form the optical material comprises: a) monomeric compounds adapted to polymerize, b) at least one catalyst for initiating the polymerization of said monomeric compounds, and c) from more than 1,500 ppm to 3,000 ppm of a release agent, as compared to the total weight of the polymer...