US3815575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooking utensil
Assignee: Individual
•
Filing: 1973-02-27
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Granted: 1974-06-11
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Expires: 1993-02-27
Abstract
Abstract A utensil, or appliance, having a cooking surface in which the heat output area remains substantially isothermal during cooking of substances thereon while portions of the device are heated. The device has a suitably disposed hollow chamber intermediate the heated portions and the cooking surface, which chamber contains a first nonvaporizing liquid of high boiling point, preferably above 500* F. Sealed tube means is disposed in said first liquid and contains a second vaporizable liquid having a boiling point less than 250* F. The volume of the high boiling liquid is reduced by filling with hollow spheres of negligible specific heat. The boiling and condensation of the second liquid during cooling improve rate of heat conductivity from the heated portion to the cooking surface.
Inventors
- 👤 L Danis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:51
CPC Classifications
A; A47; A47J; A47J37/00; A47J37/10; A47J27/00; A47J27/02; A47J27/024; Y; Y10; Y10S; Y10S165/00; Y10S165/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A cooking utensil characterized in that said utensil has, a. a cooking surface, b. a heating surface adapted to receive heat from a source thereof, c. a sealed cavity formed therein, said cavity being disposed intermediate said cooking surface and said heating surface, said cavity being partially filled with a first liquid having a boiling point in excess of any desired predetermined maximum cooking temperature such that said liquid does not boil during heating and cooking; d. a plurality of hollow spheres disposed in said cavity and immersed in said first liquid; e. tube means disposed in said cavity and immersed in said liquid, said tube means having the interior thereof sealed and partially filled with a second liquid having a boiling point substantially less than the desired cooking surface temperature such that said second liquid boils and condenses during heating and cooking.
Claim 2
Dependent Claim
143 words
A cooking utensil characterized in that said utensil has, a. a cooking surface, b. a heating surface adapted to receive heat from a source thereof, c. a sealed cavity formed therein, said cavity being disposed intermediate said cooking surface and said heating surface, said cavity being partially filled with a first liquid having a boiling point in excess of any desired predetermined maximum cooking temperature such that said liquid does not boil during heating and cooking; d. a plurality of hollow spheres disposed in said cavity and immersed in said first liquid; e. tube means disposed in said cavity and immersed in said liquid, said tube means having the interior thereof sealed and partially filled with a second liquid having a boiling point substantially less than the desired cooking surface temperature such that said second liquid boils and condenses during heating and cooking.
Claim 3
Dependent Claim
14 words
The utensil defined in claim 1 wherein said first liquid is a silicone liquid.
Claim 4
Dependent Claim
36 words
The utensil defined in claim 1, wherein said second fluid is one of the group consisting of water, methyl alcohol, ethylene glycol, a mixture of glycol and water and a mixture of methyl alchol and water.
Claim 5
Dependent Claim
15 words
The utensil defined in claim 1 wherein said hollow spheres are formed of glass material.
Claim 6
Dependent Claim
16 words
The utensil defined in claim 1, wherein said hollow spheres are formed of corrosion resistant metal.
Claim 7
Dependent Claim
19 words
The utensil defined in claim 1, wherein said first liquid has a boiling point not lower than 500* F.
Claim 8
Dependent Claim
145 words
A cooking appliance characterized in that said appliance has: a. a heat dispensing surface; b. a heated surface adapted to receive heat from a source of heat; c. a sealed cavity formed therein and disposed intermediate said heat dispensing surface and said heating surface, said cavity being partially filled with a first liquid having a boiling point in excess of any desired predetermined maximum cooling temperature, such that said liquid does not boil during heating and cooking; d. a pluRality of hollow spheres disposed in said cavity and immersed in said first liquid; e. tube means disposed in said cavity and immersed in said first liquid, said tube means having the interior thereof sealed and partially filled with a second liquid having a boiling point substantially less than the desired cooking surface temperature such that said second liquid boils and condenses during heating and cooking.
Claim 9
Dependent Claim
145 words
A cooking appliance characterized in that said appliance has: a. a heat dispensing surface; b. a heated surface adapted to receive heat from a source of heat; c. a sealed cavity formed therein and disposed intermediate said heat dispensing surface and said heating surface, said cavity being partially filled with a first liquid having a boiling point in excess of any desired predetermined maximum cooling temperature, such that said liquid does not boil during heating and cooking; d. a pluRality of hollow spheres disposed in said cavity and immersed in said first liquid; e. tube means disposed in said cavity and immersed in said first liquid, said tube means having the interior thereof sealed and partially filled with a second liquid having a boiling point substantially less than the desired cooking surface temperature such that said second liquid boils and condenses during heating and cooking.
Claim 10
Dependent Claim
46 words
The appliance defined in claim 7, wherein said primary working liquid is a silicone liquid and said secondary liquid is one of the group consisting of water, ethylene glycol, a mixture of water and ethylene glycol, methyl alcohol or a mixture of water and methyl alcohol.
Claim 11
Dependent Claim
31 words
The appliance defined in claim 7 wherein said primary liquid has a boiling point not less than 500* F and said secondary liquid has a boiling point less than 250* F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |