25. Thermos Vacuum Flask

Year Invented: 1892

Designer: Sir James Dewar

Chemist and physicist Sir James Dewar invented the vacuum flask in 1892. The flask consists of two walls that have air vacuumed out from between them to keep liquids hot or cold longer. Unfortunately, Dewar never patented his invention, and a German company, Thermos GmbH, ended up manufacturing it in 1904, subsequently patenting the design and leaving Dewar with no rights to the product.

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