Abstract: A disposable sleeve for containers and systems and methods using such a disposable sleeve. The disposable sleeve includes a liner having inner and outer surfaces, a housing coupled to the inner surface of the liner with the housing defining a pocket and an opening to access the pocket, a heating element disposed within the pocket, and a cover disposed over the opening and coupled to the housing to enclose the pocket. The cover is at least partially removable from the housing to uncover at least a portion of the opening and to enable activation of the heating element to generate heat upon exposure to air.

Abstract: A disposable sleeve for a container including a liner having inner and outer surfaces; a housing coupled to said inner surface of said liner with said housing defining a pocket and an opening to access said pocket; a heating element disposed within said pocket; and a cover disposed over said opening and coupled to said housing to enclose said pocket, wherein said cover is at least partially removable from said housing to uncover at least a portion of said opening and to enable activation of said heating element to generate heat upon exposure to air.

Abstract: Disposable devices for maintaining the contents of containers, such as hot beverage cups, at or near a desired temperature for an extended period of time. The disposable devices include a sleeve having an inner surface, an outer surface, and a cavity that contains a heating element. The device is configured to define an interior passage that is sized and able to conform to an exterior shape of a container such that heat can be transferred from the heating element to the container. The device includes openings that allow air to contact and activate the heating element via initiation of a heat-generating reaction.

Abstract: A disposable sleeve for a container including a liner having inner and outer surfaces; a housing coupled to said inner surface of said liner with said housing defining a pocket and an opening to access said pocket; a heating element disposed within said pocket; and a cover disposed over said opening and coupled to said housing to enclose said pocket, wherein said cover is at least partially removable from said housing to uncover at least a portion of said opening and to enable activation of said heating element to generate heat upon exposure to air.

Abstract: A disposable sleeve for a container includes a liner for contacting the container and defining an inner surface and an outer surface. The disposable sleeve also includes a heating element disposed between the inner and outer surfaces to provide heat to the container via a heat-generating reaction, and a frictional material having a coefficient of static friction between 0.5 and 2. The frictional material is disposed on the inner surface for direct contact with the container.