US3909591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooking vessel
Assignee: Individual
•
Filing: 1973-10-29
•
Granted: 1975-09-30
•
Expires: 1993-10-29
Abstract
Abstract The bottom wall and lower sidewall portions of a cooking vessel have a greater thickness and an ornamentally contrasting exterior color from the upper sidewall portion thereof. The utensil is formed by uniting a cap to a main body, preferably by forming a hermetically sealed zone while in a vacuum. An electrical heating element may be located between the bodies. The ornamentally contrasting colors may be produced by a coating process or by using different metals for the exterior surfaces of the cap and main body.
Inventors
- 👤 John B Ulam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:07
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/002; A47J36/00; A47J36/02; Y; Y10; Y10S; Y10S29/00; Y10S29/044
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
154 words
A cooking vessel comprising a metallic cup shaped main body having a bottom wall having upper and lower surfaces, said bottom wall being surrounded by an upstanding peripheral sidewall having interior and exterior surfaces, a metallic cap having a bottom wall with upper and lower surfaces, meAns permanently bonding the periphery of the cap to the main body, and means for forcing said upper surface of the bottom wall of the cap against said lower surface of the bottom wall of the main body, said means being an hermetically sealed zone at an interface between the main body and the cap, said hermetically sealed zone being at subatmospheric pressure to establish a pressure differential between the atmosphere and the hermetically sealed zone, said lower surface of the bottom wall of the main body being drawn by said pressure differential against said upper surface of the bottom wall of the cap by said pressure differential.
Claim 2
Dependent Claim
154 words
A cooking vessel comprising a metallic cup shaped main body having a bottom wall having upper and lower surfaces, said bottom wall being surrounded by an upstanding peripheral sidewall having interior and exterior surfaces, a metallic cap having a bottom wall with upper and lower surfaces, meAns permanently bonding the periphery of the cap to the main body, and means for forcing said upper surface of the bottom wall of the cap against said lower surface of the bottom wall of the main body, said means being an hermetically sealed zone at an interface between the main body and the cap, said hermetically sealed zone being at subatmospheric pressure to establish a pressure differential between the atmosphere and the hermetically sealed zone, said lower surface of the bottom wall of the main body being drawn by said pressure differential against said upper surface of the bottom wall of the cap by said pressure differential.
Claim 3
Dependent Claim
24 words
The cooking vessel of claim 1 wherein the main body and cap are each formed of composite sheet materials formed of two different metals.
Claim 4
Dependent Claim
34 words
The cooking vessel of claim 2 wherein the main body and cap are each formed of the same materials, with the entirely of the contacting and adjacent surfaces thereof being of the same metal.
Claim 5
Dependent Claim
48 words
The cooking vessel of claim 3 wherein stainless steel is the metal which forms the following: the upper surface of the bottom wall of the main body, the interior surface of the sidewall of the main body, and the lower surface of the bottom wall of the cap.
Claim 6
Dependent Claim
47 words
The cooking vessel of claim 1 wherein the lower surface of the bottom wall of the main body is in heat-transferring contact with the upper surface of the bottom wall of the cap, said cap serving to distribute heat to the bottom wall of the main body.
Claim 7
Dependent Claim
39 words
The cooking vessel of claim 1 wherein an electric heating element is located between the main body and the cap, said heating element being in heat-conducting relationship with the lower surface of the bottom wall of the main body.
Claim 8
Dependent Claim
29 words
The cooking vessel of claim 1 wherein the exterior surface of the sidewall of the main body has a portion extending above the cap provided with a surface colorant.
Claim 9
Dependent Claim
13 words
The cooking vessel of claim 7 wherein the surface colorant is porcelain enamel.
Claim 10
Dependent Claim
15 words
The cooking vessel of claim 7 wherein the surface colorant is of the anodic type.
Claim 11
Dependent Claim
64 words
The cooking vessel of claim 9 wherein the cap has upstanding sidewalls with interior and exterior surfaces which are shorter than the sidewall of the main body, the materials which form the following surfaces are incapable of having their color changed by an anodic process: the upper surface and interior surface of the main body; the lower surface and exterior surface of the cap.
Claim 12
Dependent Claim
17 words
The cooking vessel of claim 10 wherein the surfaces listed in claim 10 are of stainless steel.
Claim 13
Dependent Claim
16 words
The cooking vessel of claim 11 wherein the exterior surface of the main body is aluminum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |