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US3734077A Expired / Lapsed US ⏱️ 0.0 years remaining

Heat-retaining food server

Assignee: American Hospital Supply Corp
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Filing: 1972-03-15
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Granted: 1973-05-22
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Expires: 1992-03-15
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Abstract

Abstract A hollow food serving dish having upper and lower metal shells with a heat-retaining pellet and a resilient cushioning element disposed therebetween. The shells are generally rectangular in shape, when viewed in elevation, and are hermetically sealed together only at their peripheral edges. Limited expansion is permitted upon heating, but the danger of bursting is avoided by reason of the configuration and construction of the dish.

Inventors

  • 👤 C Murdough
  • 👤 A Neely

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 14:28
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/24; A47J36/2494

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 100 words
A food serving dish comprising a generally rectangular upper metal shell, a generally rectangular lower metal shell hermetically sealed to the upper shell only about the peripheral edges thereof, said upper and lower shells defining a space therebetween, a heat-retention pellet disposed within said space in direct contact with the undersurface of said upper shell, and a resilient heat-insulating cushion within said space between said pelLet and said lower shell urging said pellet upwardly to maintain the same in direct contact with the undersurface of said upper shell throughout the range of temperatures to which said dish is normally subjected.
Claim 2
Dependent Claim 100 words
A food serving dish comprising a generally rectangular upper metal shell, a generally rectangular lower metal shell hermetically sealed to the upper shell only about the peripheral edges thereof, said upper and lower shells defining a space therebetween, a heat-retention pellet disposed within said space in direct contact with the undersurface of said upper shell, and a resilient heat-insulating cushion within said space between said pelLet and said lower shell urging said pellet upwardly to maintain the same in direct contact with the undersurface of said upper shell throughout the range of temperatures to which said dish is normally subjected.
Claim 3
Dependent Claim 14 words
The structure of claim 1 in which said pellet is generally rectangular in shape.
Claim 4
Dependent Claim 56 words
The structure of claim 2 in which said pellet has a central aperture, said upper shell having a centrally depressed portion projecting downwardly into said aperture, and said lower shell having a centrally raised portion disposed within said aperture, said central portions of said upper and lower shells being disposed adjacent but unattached to each other.
Claim 5
Dependent Claim 21 words
The structure of claim 3 in which said central portions of said upper and lower shells are generally circular in configuration.
Claim 6
Dependent Claim 17 words
The structure of claim 4 in which said upper and lower shells are formed of stainless steel.
Claim 7
Dependent Claim 187 words
A food serving dish comprising a generally rectangular upper metal shell having a substantially horizontal wall portion and an upwardly and outwardly inclined side wall portion extending thereabout, said horizontal wall portion being rectangular in shape and being dimensioned so that the shortest distance from the center of such horizontal portion to the outer limits thereof falls within the range of about 2 to 3 inches, a generally rectangular lower metal shell having a horizontal portion and having an upwardly and outwardly inclined side wall portion, the inclined side wall portions of said upper and lower shells having their peripheral edges hermetically sealed together, said upper and lower shells defining a space therebetween, a heat-retention pellet disposed within said space, said pellet having an enlarged flat portion adapted to engage the undersurface of the horizontal wall of said upper shell, and a resilient heat-insulating cushion within said space between said pellet and said lower shell for urging said pellet upwardly and maintaining the same in contact with the undersurface of said upper shell, the horizontal portions of said upper and lower shells being unsecured to each other.
Claim 8
Dependent Claim 187 words
A food serving dish comprising a generally rectangular upper metal shell having a substantially horizontal wall portion and an upwardly and outwardly inclined side wall portion extending thereabout, said horizontal wall portion being rectangular in shape and being dimensioned so that the shortest distance from the center of such horizontal portion to the outer limits thereof falls within the range of about 2 to 3 inches, a generally rectangular lower metal shell having a horizontal portion and having an upwardly and outwardly inclined side wall portion, the inclined side wall portions of said upper and lower shells having their peripheral edges hermetically sealed together, said upper and lower shells defining a space therebetween, a heat-retention pellet disposed within said space, said pellet having an enlarged flat portion adapted to engage the undersurface of the horizontal wall of said upper shell, and a resilient heat-insulating cushion within said space between said pellet and said lower shell for urging said pellet upwardly and maintaining the same in contact with the undersurface of said upper shell, the horizontal portions of said upper and lower shells being unsecured to each other.
Claim 9
Dependent Claim 20 words
The structure of claim 6 in which said heat-retention pellet is formed of metal and is generally rectangular in shape.
Claim 10
Dependent Claim 42 words
The structure of claim 6 in which said pellet is provided with a central aperture, and at least one of the horizontal portions of said upper and lower shells being provided with a central portion projecting into said aperture of said pellet.
Claim 11
Dependent Claim 25 words
The structure of claim 8 in which both said upper and lower shells are provided with central portions extending into the aperture of said pellet.
Claim 12
Dependent Claim 28 words
The structure of claim 9 in which said aperture of said pellet and said central portions of said upper and lower shells are all generally circular in configuration.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-05-21 1976-11-20 1977-05-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-05-21 1980-11-20 1981-05-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-05-21 1984-11-20 1985-05-22 $7700.00 Window Closed / Lapsed

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