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The invention provides an electrically heated jacket to maintain a hot beverage contained in a disposable hot-beverage container at optimum temperature for consumption. Electrical power for heating may be provided, in various embodiments, by household electric power, electric power from a motor vehi

The invention provides an electrically heated jacket to maintain a hot beverage contained in a disposable hot-beverage container at optimum temperature for consumption. Electrical power for heating may be provided, in various embodiments, by household electric power, electric power from a motor vehicle electrical system, or batteries, which may be disposable or rechargeable. The invention also provides a method for keeping a hot beverage warm comprising providing freshly recharged batteries convenient to the point-of-sale of hot beverages.

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1. A device for keeping a hot beverage, contained in a container having the shape of the frustum of a cone, at the desired elevated temperature for consumption, comprising:a flexible heating jacket having the shape of a frustum of a cone into which said container can be inserted such that said jacke

1. A device for keeping a hot beverage, contained in a container having the shape of the frustum of a cone, at the desired elevated temperature for consumption, comprising:a flexible heating jacket having the shape of a frustum of a cone into which said container can be inserted such that said jacket substantially surrounds and contacts at least a portion of said container, said flexible heating jacket being capable of being transformed into a substantially flattened configuration when not enclosing said container; electrically powered heating means embedded in said heating jacket; and means for supplying electric power to said heating jacket. 2. The device of claim 1 wherein the heating jacket comprises:a flexible inner layer for contacting the beverage cup; flexible electrical heating means disposed across the inner layer; disconnectable electrical connector means for supplying electric power to said heating jacket; flexible thermally-resistant electrical insulating material enclosing the electrical heating means; and a flexible thermally-insulating outer layer. 3. The device of claim 2 wherein the disconnectable electrical connector means for supplying electric power to said heating jacket comprise an electrical cord with an adapter at one end which can plug into and make electrical contact with an motor vehicle cigarette lighter, and an adapter at the other end which can plug into and make electrical contact with a mating connector comprised in the heating jacket.4. The device of claim 2 wherein the disconnectable electrical connector means for supplying electric power to said heating jacket comprise an electrical adapter which can be plugged into and make electrical contact with standard 110/120 VAC electrical outlet with an electric cord terminating in and in electrical contact with an adapter at the other end which can plug into and make electrical contact with a mating connector comprised in the heating jacket.5. The device of claim 4 wherein the electrical adapter which can be plugged into and make electrical contact with standard 110/120 VAC electrical outlet comprises a step-down transformer to reduce the voltage supplied to the cup warmer.6. The device of claim 1 wherein the means for supplying electric power to the heating jacket comprise batteries.7. The device of claim 6 wherein the batteries are rechargeable.8. The device of claim 1 wherein the beating jacket comprises:a flexible inner layer for contacting the beverage cup; flexible electrical heating means disposed across the inner layer; batteries to supply electric power to said heating jacket; flexible thermally-resistant electrical insulating material enclosing the electrical heating means; a flexible thermally-insulating outer layer. 9. The device of claim 8 wherein the batteries are rechargeable.10. The device of claim 6 wherein the batteries are contained in a battery holder detachably attached and disconnectably connected electrically to the heating jacket.11. The device of claim 9 comprising disconnectable electrical connection means to provide electrical power to the heating jacket, and to recharge said rechargeable batteries, comprised in a cup holder for permanent installation as an integral component of a motor vehicle.12. The device of claim 9 comprising disconnectable electrical connection means to provide electrical power to the heating jacket, and to recharge said rechargeable batteries, comprised in a cup holder for permanent installation in a motor vehicle.13. The device of claim 10 comprising disconnectable electrical connection means to provide electrical power to the heating jacket and to recharge said rechargeable batteries comprised in a cup holder for permanent installation as an integral component of a motor vehicle.14. The device of claim 1 wherein said flexible heating jacket comprises a substantially flat structure having upper and lower edges and lateral edges, wherein said upper and lower edges have the shape of sectors of concentric circles and said lateral edges have the shape of radii of said concentric circles, and wherein said heating jacket additionally comprises detachable attachment means such that said lateral edges may be detachably attached or overlapped so that said heating jacket forms a frustum of a cone.15. The heating jacket of claim 5 wherein said electrical adapter further comprises a rectifier such that the adapter provides a DC supply to said heating jacket at the same voltage and polarity as would be provided by an automotive vehicle electrical supply.16. The heating jacket of claim 2 wherein said disconnectable electrical connector means comprise an electrically polarized connector which can be disconnectably connected to a mating connector comprised in said heating jacket.17. The device of claim 8 wherein said batteries comprise thin, flexible rechargeable batteries disposed across the exterior of said flexible thermally-resistant electrical insulating material enclosing said electrical heating means.18. The device of claim 6 wherein said batteries are contained in a battery holder which is flexibly attached to said heating jacket at at least one point and is detachably attached to said heating jacket at at least one other point, such that said battery holder can be detached from the at least one other point and folded flat when said heating jacket is transformed into a substantially flattened configuration.19. The device of claim 18 comprising disconnectable electrical connection means to provide electrical power to the heating jacket and to recharge said rechargeable batteries comprised in a cup holder for permanent installation in a motor vehicle.20. A method of keeping a hot beverage, contained in a container having the shape of the frustum of a cone, at the desired elevated temperature for consumption, comprising:providing a flexible electrically heated jacket having the shape of a frustum of a cone into which said container can be inserted such that said jacket substantially surrounds and contacts at least a portion of said container, said flexible heating jacket being capable of being transformed into a substantially flattened configuration when not enclosing said container, wherein the electrical power for said heating jacket is provided by a rechargeable battery contained in a battery holder detachably attached and disconnectably connected electrically to the heating jacket; providing a battery dispensing machine into which a partially discharged battery in its holder can be inserted and which will in turn dispense a fully recharged battery in its holder. 21. The method of claim 20 wherein the hot beverage is provided at a commercial establishment, and the battery dispensing machine is provided at said establishment.22. A cup holder for permanent installation as an integral component of a motor vehicle comprising means for keeping a hot beverage in a container at the desired elevated temperature for consumption, comprising:a cavity into which said beverage container can be inserted; electrically powered heating means embedded in the walls of said cavity; means for supplying electric power to said heating means; and a switch controlling the application of electric power to said heating means. 23. The cup holder of claim 22 in which said cavity has the shape of a frustum of a cone.24. The cup holder of claim 22 in which said cavity comprises flexible walls.25. A device detachably connectable to a computer for keeping a hot beverage, contained in a container having the shape of the frustum of a cone, at the desired elevated temperature for consumption, comprising:a flexible heating jacket having the shape of a frustum of a cone into which said container can be inserted such that said jacket substantially surrounds and contacts at least a portion of said container, said flexible heating jacket being capable of being transformed into a substantially flattened configuration when not enclosing said container; electrically powered heating means embedded in said heating jacket; and means for supplying electric power to said heating jacket. 26. The device of claim 25 in which said means for supplying electric power to said heating jacket comprise an electrical adapter which can be plugged into and make electrical contact with standard 110/120 VAC electrical outlet with an electric cord terminating in and in electrical contact with an adapter at the other end which can plug into and make electrical contact with a mating connector comprised in the heating jacket.27. The device of claim 26 wherein the electrical adapter which can be plugged into and make electrical contact with standard 110/120 VAC electrical outlet comprises a step-down transformer to reduce the voltage supplied to the cup warmer.28. The device of claim 25 in which said means for supplying electric power to said heating jacket comprise an electrical adapter which can be plugged into and make electrical contact with a mating connector capable of supplying power from said computer.