ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,724,322, issued on Sept. 1, was assigned to Zhuhai Cufu Optical Technology Co. Ltd. (Zhuhai, China).
"Magnetically attractable filter device" was invented by Guokui Yuan (Zhuhai, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A magnetically attractable filter device includes an adapter ring, designed to be arranged at the front end of a lens; one or more filters, each of which includes a filter frame and a lens element, with the lens element mounted on the filter frame. The filters are sequentially stacked at the front end of the adapter ring, with the adapter ring and the adjacent filters being magnetically attracted to each other, adjacent filte...