Today in 1980, US Patent 4183226 A was issued, an invention of Stanley R. Moore, assigned to Freeze Sleeves Of America, Inc., for his “Refrigerated Beverage Holder.” Here’s the Abstract:
Means for chilling and insulating a canned or bottled beverage such as beer including a cylindrical sleeve of reusable refrigerant disposed within an insulative beverage can holder and displacing the annular “dead air” cavity between a beverage can situated therein and the side walls of the holder. The reusable refrigerant is a substance which may be frozen in conventional refrigerator freezers whereby the refrigerant in a frozen state will chill and keep chilled beer or the like disposed there within. In this manner, a beverage may be quickly chilled whether initially refrigerated or not and while being consumed out of doors. Moreover, the chilled temperature is normally unachievable in conventional refrigerators and is especially not maintainable for any length of time in conventional “dead-air” insulative holders.