ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,464,612, issued on Nov. 4, was assigned to Guangzhou Rising Dragon Recreation Industrial Co. Ltd. (Guangzhou, China).
"Controller for bathtub lamp" was invented by Ziqin Guo (Guangzhou, China) and Bo Liang (Guangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A controller for a bathtub lamp comprises an MCU module, an R2R network module, a DCDC module and an LED module which are electrically connected in sequence; the MCU chip is used for generating variable digital signals corresponding to different brightness levels required in different modes and generating, according to values of the digital signals corresponding to different brightness le...