Oct 27, 2022adminBento Box, electric lunch box recipes, food safety storage conditions, induction heating cooker recipes, school lunch box ideas, thermos recipes, USB Food Warmer, USB lunch box, USB Portable Food Warmer, 保溫飯壺 We are pleased to announce that our Japanese invention patent is allowed to grant. As some people know, it is not easy to award a granted patent in Japan especially an invention patent in the very crowded field of heating and thermo products.