ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,544,548, issued on Feb. 10, was assigned to Zhejiang Hedao Holding Co. Ltd. (Hangzhou, China).
"Motor and a tattoo pen using the same" was invented by Jian Wu (Zhejiang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed in the present invention is a motor comprising a coil assembly configured to produce a magnetic field in the axis direction of the motor when there is current in the coil, a line motion shaft set passing through the coil assembly in said axis direction, at least one end of said line motion shaft being set extending out of the coil assembly; and a permanent magnet set on the end of said line motion shaft extending out of the ...