US Patent Issued to TOK on March 4 for "Rotary damper" (Japanese Inventor)

ALEXANDRIA, Va., March 5 -- United States Patent no. 12,241,520, issued on March 4, was assigned to TOK INC. (Tokyo).

"Rotary damper" was invented by Junichiro Akiba (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A rotary damper that does not cause a problem that a rotational resistance fluctuates during a rotation of a rotor is provided. On a bottom surface of a housing, a plurality of walls are erected concentrically centered on a bearing portion. Notches are formed in the walls at point-symmetrical peripheral positions centered on the bearing portion, and each notch is distributed and arranged at peripheral positions that evenly divide a circumference centered on the bearing portion between the adj...