[a. Gr. θερμός warm, hot.] A registered trade term noting a flask, bottle, or the like capable of being kept hot by the device (invented by Sir James Dewar) of surrounding the interior vessel with a vacuum jacket to prevent the conduction of heat.
Patented 1904, No. 4421; not named. Name (Trade Mark No. 289.470) adv. in Trade Marks Jrnl., 20 March, 1907.
1907. Eng. Mech., 18 Oct., 246. This invention [of Sir James Dewar] is utilised in the thermos flask.
1909. Ladies’ Field, 28 Aug., 511/2. A Thermos bottle filled with hot coffee was not forgotten.
1909. Westm. Gaz., 16 Sept., 5/2. Lieutenant Shackleton testified to the fact that the Thermos flask helped him to perform his wonderful feats in the Antarctic.
1910. Repts. Patent Cases, XXVII. 396. This was the Dewar vessel…. In 1904 it occurred to a Mr. Burger that this vessel could be adapted for use as a flask … the result … was the production of the well known Thermos flask.
