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Solar heated vacuum flask

  • US 4,196,721 A
  • Filed: 11/30/1978
  • Issued: 04/08/1980
  • Est. Priority Date: 10/18/1978
  • Status: Expired due to Term
First Claim
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1. In a vacuum flask of the type including a vessel having an inner wall and an outer wall, both permeable to solar radiation and bounding a space exhausted of air, and a protective jacket, the improvement which comprises:

  • a said protective jacket of which at least one part is capable of being open, said part having an inner surface with reflective means to deflect solar radiation to said vessel to heat the contents thereof when said part is swung open.

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