ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,797, issued on Sept. 23.
"Combination roller blind with fine adjustment function for shading" was invented by Phillip Hyun Kim (Upland, Calif.) and Kevin Kim (Upland, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a combination roller blind wherein a fine adjustment means is provided behind an upper face of a headrail, the adjustment means causing an end of a blind sheet wrapped around a blind roll and an end opposite thereof to be fine-adjustably wrapped and unwrapped. When the blind is installed on a ceiling or a window frame to completely conceal the bottom edge of the window so that a bottom edge of a wei...