ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,527,434, issued on Jan. 20.
"Interchangeable grinding cartridge device" was invented by Alex Liu (Beaverton, Ore.) and Hongjin Liu (Guangdong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An automatic grinder and a grinding method thereof. The grinder includes a control structure and at least one material container assembly. The control structure includes a driving assembly and a connecting structure connected to the driving assembly. The material container assembly includes a material container body (20), a grinding head (22) fixedly connected to the material container body (20), and a grinding sleeve (25) rotatably connected to the grinding he...