Microwave safe vacuum insulated containers and method of manufacture
AssigneeAladdin Industries, Incorporated
InventorsHerbert M. Stewart, William J. Tanner
Life of this patent
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Abstract
Vacuum insulated containers are disclosed in which the usual metallic coating applied to the vacuum filler is omitted. In its place an electrically nonconducting, nonadsorbent granular material, such as finely divided silica, is employed in the annular, evacuated space to reduce infrared radiation loss. The construction is safe for use in microwave ovens and has a relatively high insulating efficiency as compared with vacuum fillers without infra barriers and nonvacuum insulated containers.
Claims12
A vacuum insulated container construction including an infrared radiation barrier which is safe for use in microwave ovens comprising:
- (a) a glass filler formed in the general shape of a container having inner and outer walls and defining an annular space between said walls, air being substantially evacuated from said annular space, said inner wall defining a thermal insulating container interior,
- (b) an infrared barrier formed by an electrically nonconducting granular material which does not adsorb microwave energy provided in the annular space between said walls in an amount sufficient to substantially fill said space,
- (c) means surrounding said filler, at least on the outer wall thereof, for protecting against damage to said filler.
A vacuum filler construction including an infrared radiation barrier which is safe for use in microwave ovens comprising:
- (a) a glass filler formed in the general shape of a container having inner and outer walls and defining an annular space between said walls, air being substantially evacuated from said annular space, said inner wall defining an insulating container interior,
- (b) an infrared barrier comprising an electrically nonconducting granular material which does not adsorb microwave energy provided in the annular space between said walls in an amount sufficient to substantially fill said space.
A method of making a vacuum filler construction including an infrared radiation barrier which is safe for use in microwave ovens comprising the steps of:
- (a) forming a glass filler in the general shape of a container, said filler having inner and outer walls and defining an annular space therebetween, the filler being provided with a sealable opening through one of said walls,
- (b) substantially filling the annular space between the walls with an infrared barrier comprising an electrically nonconducting granular material which does not adsorb microwave energy,
- (c) forming a partial vacuum in the annular space by withdrawing air through said sealable opening, and
- (d) sealing said opening.
Dependencies are inferred from the claim text.