ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,474,511, issued on Nov. 18, was assigned to XIAMEN JUANWEN TECHNOLOGY Co. LTD. (Xiamen, China).
"Sub-wavelength grating optical film" was invented by Zhicheng Ye (Fujian, China) and Jun Zheng (Fujian, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sub-wavelength grating optical film comprises a plurality of one-dimensional periodic grating units repeatedly arranged side by side. Each grating unit with a period of p comprises a first medium, a second medium, a third material, a fourth material, a fifth material, a sixth medium and a seventh medium, wherein the sixth medium serving as a substrate and the seventh medium serving as a covering layer ...