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Tervis Tumbler Company is an American manufacturer of double-walled, insulated tumblers. The double-wall insulation is made by inserting a liner inside an outer shell, creating a layer of air between them. The two liners are then permanently fused together. The insulation reduces condensation and keeps beverages hotter or colder longer than non ...
Diagram of a vacuum flask Gustav Robert Paalen, Double Walled Vessel. Patent 27 June 1908, published 13 July 1909 Patent 27 June 1908, published 13 July 1909 The vacuum flask was designed and invented by Scottish scientist James Dewar in 1892 as a result of his research in the field of cryogenics and is sometimes called a Dewar flask in his honour.