US3837330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-retaining server
Assignee: American Hospital Supply Corp
•
Filing: 1973-03-28
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Granted: 1974-09-24
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Expires: 1993-03-28
Abstract
Abstract A hollow food serving dish having upper and lower metal shells with a rigid heat-retaining member disposed therebetween. the shells are imperforate and are hermetically sealed together along their peripheral edges. Limited expansion is permitted upon heating, but the danger of bursting is avoided because of the secure interconnection between the upper shell and the rigid member and because of the interfitting relationship between the rigid member and the bottom shell with its concave configuration and peripheral shoulder.
Inventors
- 👤 R Lanigan
- 👤 O Szymber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:53
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/24; A47J36/2494
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
A heat-retaining food server comprising an upper metal shell having a substantially flat central portion, a lower metal shell hermetically sealed to said upper shell about only the peripheral edges thereof, said upper and lower shells defining a space therebetween, a rigid heat-retention body disposed within and substantially filling said space, said body having a substantially flat upper surface engaging the undersurface of said upper shell''s flat central portion, and means rigidly securing said body to said upper shell, said body having a concave undersurface and said lower shell having a bottom wall of dome-shaped configuration throughout substantially its entire extent, the curvature of said dome-shaped bottom wall conforming with and being received within the concavity of said body.
Claim 2
Dependent Claim
119 words
A heat-retaining food server comprising an upper metal shell having a substantially flat central portion, a lower metal shell hermetically sealed to said upper shell about only the peripheral edges thereof, said upper and lower shells defining a space therebetween, a rigid heat-retention body disposed within and substantially filling said space, said body having a substantially flat upper surface engaging the undersurface of said upper shell''s flat central portion, and means rigidly securing said body to said upper shell, said body having a concave undersurface and said lower shell having a bottom wall of dome-shaped configuration throughout substantially its entire extent, the curvature of said dome-shaped bottom wall conforming with and being received within the concavity of said body.
Claim 3
Dependent Claim
14 words
The server of claim 1 in which said upper and lower shells are imperforate.
Claim 4
Dependent Claim
14 words
The server of claim 1 in which said heat-retention body is formed of metal.
Claim 5
Dependent Claim
70 words
The server of claim 1 in which said heat-retention body is provided with a central opening, said means comprising a connecting member extending through said opening and permanently fixed to the undersurface of said upper shell, said connecting member having a flange at its lower end larger than said opening, said flange engaging the undersurface of said body for holding said body tightly against the undersurface of said upper shell.
Claim 6
Dependent Claim
16 words
The server of claim 1 in which said upper and lower shells are circular in outline.
Claim 7
Dependent Claim
14 words
The server of claim 4 in which said heat-retention body is annular in configuration.
Claim 8
Dependent Claim
157 words
A heat-retaining food server comprising an upper metal shell having a substantially flat central portion, a lower metal shell hermetically sealed to said upper shell about only thE peripheral edges thereof, said upper and lower shells defining a space therebetween, a rigid heat-retention body disposed within and substantially filling said space, said body having a substantially flat upper surface engaging the undersurface of said upper shell''s flat central portion, and means rigidly securing said body to said upper shell, said body having a concave undersurface terminating at its outer limits in a depending rim defining an inwardly-facing annular surface, said lower shell having a bottom wall of dome-shaped configuration throughout substantially its entire extent, the curvature of said dome-shaped bottom wall conforming with and being received within the concavity of said body, said lower shell also having a shoulder extending about the dome-shaped bottom wall thereof and bearing against the inwardly-facing annular surface of said heat-retention body.
Claim 9
Dependent Claim
157 words
A heat-retaining food server comprising an upper metal shell having a substantially flat central portion, a lower metal shell hermetically sealed to said upper shell about only thE peripheral edges thereof, said upper and lower shells defining a space therebetween, a rigid heat-retention body disposed within and substantially filling said space, said body having a substantially flat upper surface engaging the undersurface of said upper shell''s flat central portion, and means rigidly securing said body to said upper shell, said body having a concave undersurface terminating at its outer limits in a depending rim defining an inwardly-facing annular surface, said lower shell having a bottom wall of dome-shaped configuration throughout substantially its entire extent, the curvature of said dome-shaped bottom wall conforming with and being received within the concavity of said body, said lower shell also having a shoulder extending about the dome-shaped bottom wall thereof and bearing against the inwardly-facing annular surface of said heat-retention body.
Claim 10
Dependent Claim
17 words
The server of claim 7 in which said upper and lower shells are generally circular in outline.
Claim 11
Dependent Claim
20 words
The server of claim 7 in which said heat-retention body is generally circular in outline and is formed of metal.
Claim 12
Dependent Claim
72 words
The server of claim 7 in which said heat-retention body is provided with a central opening, said means comprising a connecting member extending through said opening and being permanently fixed to the undersurface of said upper shell, said connecting member having a flange at its lower end larger than said opening, said flange engaging the undersurface of said body for holding said heat-retention body firmly against the undersurface of said upper shell.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |