ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,496,490, issued on Dec. 16.
"Method for adjusting blade resistance" was invented by Chih-Yung Hsu (Tainan, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for adjusting a blade resistance includes the steps of providing an external force to drive a plurality of blades to be rotated synchronously in a fluid to obtain a rotational resistance; providing an adjustment force to change a radius of rotation of the blades along with an opening and closing angle, thereby changing the magnitude of the rotational resistance. Thereby, the degree of opening and closing of the blades is adjustable, and the rotational resistance is steplessly adjusted."...