Handheld portable thermally insulated metallic vessel

Abstract

To prevent abrupt deformation of the bottom wall of an inner vessel accompanied by an explosive sound due to expansion of the inner vessel or an insulating medium when heated foods or drinks are placed in the vessel or the vessel is placed in a high temperature environment such as a dryer. A handheld portable thermally insulated metallic vessel 1 comprises a thermally insulated metallic vessel base 2 and a lid 3 to cover said vessel base. The vessel base 2 is fabricated in an integral fashion by joining an inner vessel 4 and an outer vessel 5 to create an airtight space 6 between the outer vessel and the inner vessel, and the airtight space 6 is filled with a gas having a low thermal conductivity and the bottom wall of the inner vessel is formed to have a planar surface.

What is claimed is:  
     
         1 . A handheld portable thermally insulated metallic vessel comprising a thermally insulated metallic vessel base and a lid to cover the vessel base, said vessel base being made by joining an outer vessel and an inner vessel in an integral fashion to form an airtight space between the inner vessel and the outer vessel, and said airtight space being filled with a gas, wherein the bottom wall of an inner vessel is formed to have a planar surface.  
     
     
         2 . A handheld portable thermally insulated metallic vessel according to  claim 1 , wherein the side wall of said inner vessel is formed virtually perpendicular to said bottom wall.  
     
     
         3 . A handheld portable thermally insulated metallic vessel according to  claim 1 , wherein said vessel base is a shallow container where the width of said bottom wall is greater than the height of said side wall.  
     
     
         4 . A handheld portable thermally insulated metallic vessel according to  claim 2 , wherein said vessel base is a shallow container where the width of said bottom wall is greater than the height of said side wall.  
     
     
         5 . A handheld portable thermally insulated metallic vessel according to  claim 1 , wherein said handheld thermally insulated metallic vessel base consists of an oval or circular peripheral wall with the bottom.  
     
     
         6 . A handheld portable thermally insulated metallic vessel according to  claim 2 , wherein said handheld thermally insulated metallic vessel base consists of an oval or circular peripheral wall with the bottom.  
     
     
         7 . A handheld portable thermally insulated metallic vessel according to  claim 3 , wherein said handheld thermally insulated metallic vessel base consists of an oval or circular peripheral wall with the bottom.  
     
     
         8 . A handheld portable thermally insulated metallic vessel according to  claim 4 , wherein said handheld thermally insulated metallic vessel base consists of an oval or circular peripheral wall with the bottom.  
     
     
         9 . A handheld portable thermally insulated metallic vessel according to  claim 1 , wherein said handheld thermally insulated metallic vessel base consists of a rectangular peripheral wall with the bottom.  
     
     
         10 . A handheld portable thermally insulated metallic vessel according to  claim 2 , wherein said handheld thermally insulated metallic vessel base consists of a rectangular peripheral wall with the bottom.  
     
     
         11 . A handheld portable thermally insulated metallic vessel according to  claim 3 , wherein said handheld thermally insulated metallic vessel base consists of a rectangular peripheral wall with the bottom.  
     
     
         12 . A handheld portable thermally insulated metallic vessel according to  claim 4 , wherein said handheld thermally insulated metallic vessel base consists of a rectangular peripheral wall with the bottom.