U.S. patent application 20180195795 (applicant Pronto Concepts Inc., San Francisco, Calif.):
"A temperature-regulating apparatus which can rapidly chill a beverage by exposing it to a large surface area of the device interior which has a cooling gel embedded within its walls. The user pours their liquid into the device and monitors the projected temperature dropping until they reach an optimal temperature. Once optimal temperature is reached, the users will pour the liquid out of the device to end the cooling processes. Thus a superior liquid cooling solution is provided that can rapidly chill a beverage to an optimal temperature. ... The temperature-regulating material may be a cooling gel that consists of one or more of water, phase change material (PCMs), sodium chloride, propylene glycol, or the like."