U.S. patent application 20200008623 (applicant Curators of the University of Missouri, Columbia, Mo.):
"A drinking container system with multiple temperature zones, wherein the container system includes a main body having a sidewall and a bottom that define a phase change material (PCM) module receptacle, and a phase change material (PCM) module having a sidewall that defines a beverage chamber. The PCM module is disposable within the PCM module receptacle such that a beverage egress flow path is defined between the main body sidewall and the PCM module sidewall. The flow path formed in the container can make the beverage achieve the desired drinking temperature. The PCM module sidewall is at least partially filled with a phase change material and is structured and operable to provide a plurality temperature zones within the beverage chamber. Each temperature zone is operable to maintain a temperature of a respective portion of a liquid disposed within the beverage chamber within a respective temperature range."