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Thermos

Brand

A vacuum flask (also known as a Dewar flask, Dewar bottle or Thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which prevents heat transfer by conduction or convection.  Vacuum flasks are used domestically to keep beverages hot or cold for extended periods of time and for many purposes in industry.  Dewar's design was quickly transformed into a commercial item in 1904 as two German glassblowers (one of whom was Reinhold Burger) discovered that it could be used to keep cold drinks cold and warm drinks warm. The Dewar flask design was never patented, but the German men who discovered the commercial use for the product renamed it Thermos and claimed the rights to the commercial product and the trademark to the name. The manufacturing and performance of the Thermos bottle was significantly improved and refined by the viennese inventor and merchant Gustav R. Paalen, who designed various types for domestic use which he patented and distributed widely through his Thermos Bottle Companies also in the US and Canada. The name later became a genericized trademark after the term "thermos" became the household name for such a liquid container. The vacuum flask went on to be used for many different types of scientific experiments and the commercial “Thermos” was transformed into a common item. "Thermos" remains a registered trademark in some countries but was declared a genericized trademark in the US in 1963 since it is colloquially synonymous with vacuum flasks in general.

A vacuum flask (also known as a Dewar flask, Dewar bottle or Thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which prevents heat transfer by conduction or convection.  Vacuum flasks are used domestically to keep beverages hot or cold for extended periods of time and for many purposes in industry.  Dewar's design was quickly transformed into a commercial item in 1904 as two German glassblowers (one of whom was Reinhold Burger) discovered that it could be used to keep cold drinks cold and warm drinks warm. The Dewar flask design was never patented, but the German men who discovered the commercial use for the product renamed it Thermos and claimed the rights to the commercial product and the trademark to the name. The manufacturing and performance of the Thermos bottle was significantly improved and refined by the viennese inventor and merchant Gustav R. Paalen, who designed various types for domestic use which he patented and distributed widely through his Thermos Bottle Companies also in the US and Canada. The name later became a genericized trademark after the term "thermos" became the household name for such a liquid container. The vacuum flask went on to be used for many different types of scientific experiments and the commercial “Thermos” was transformed into a common item. "Thermos" remains a registered trademark in some countries but was declared a genericized trademark in the US in 1963 since it is colloquially synonymous with vacuum flasks in general.

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