It is an object of this invention to provide an improved vacuum flask designed in such a way that the liquid contents thereof can be heated by solar radiation.
The vacuum flask was designed and invented by Scottish scientist in 1892 as a result of his research in the field of and is sometimes called a Dewar flask in his honour. While performing experiments in determining the of the element of , Dewar formed a brass chamber that he enclosed in another chamber to keep the palladium at its desired temperature. He evacuated the air between the two chambers creating a partial vacuum to keep the temperature of the contents stable. Through the need for this insulated container James Dewar created the vacuum flask, which became a significant tool for chemical experiments and also became a common household item. The flask was later developed using new materials such as and ; however, Dewar refused to patent his invention.
new design stainless steel vacuum flask
Thus, the invention proposes a vacuum flask design which makes it possible to heat the contents of the flask simply and at no cost by means of solar energy. A vacuum flask of such design has many different possibilities of use, e.g., in the household or forcamping or for workers who take along lunch or snacks. However, larger-scale models of any desired size may be produced for commercial or industrial applications or for heating water or other liquids, e.g., for space-heating installations.