초록 ▼

A warmth keeping ceramic or porcelaneous vessel wherein a sealed airtight hollow chamber under a reduced pressure is formed between an inner vessel and outer vessel to keep contents warm. The hollow chamber is kept airtight under a reduced pressure by an enamel bonding the joint of the inner vessel

A warmth keeping ceramic or porcelaneous vessel wherein a sealed airtight hollow chamber under a reduced pressure is formed between an inner vessel and outer vessel to keep contents warm. The hollow chamber is kept airtight under a reduced pressure by an enamel bonding the joint of the inner vessel and outer vessel or closing fine holes made in either of the inner vessel and outer vessel, after heating vessels to discharge the air in the hollow chamber through the joint or the fine holes.

대표청구항 ▼

A method of producing a warmth keeping vessel made of ceramics characterized in that an inner vessel and outer vessel forming a warmth keeping ceramic vessel of a double-walled structure are respectively simply baked, are overlapped on each other so as to form a hollow chamber, are then enamel bonde

A method of producing a warmth keeping vessel made of ceramics characterized in that an inner vessel and outer vessel forming a warmth keeping ceramic vessel of a double-walled structure are respectively simply baked, are overlapped on each other so as to form a hollow chamber, are then enamel bonded by the painting of an enamel on the joint formed between the inner vessel and the outer vessel, are heated at a temperature of at least 1000°C. which is sufficient to effect discharge of the air in the hollow chamber through said joint but which will not effect the melting of the enamel, and are further fired at a temperature higher than the melting point of said enamel so as to be bonded together to keep the hollow chamber air tight under a reduced pressure.