Patent US3965969A successfully refreshed from Google Patents.
US3965969A
Expired / Lapsed
US
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Convertible food service cart
Assignee: Individual
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Filing: 1973-06-11
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Granted: 1976-06-29
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Expires: 1993-06-11
Abstract
Abstract A convertible food service cart including a cold tray compartment and a conversion compartment, both of which are insulated and cooled by respective refrigeration systems. The conversion compartment is provided with a plurality of electrical plugs which connect in parallel and which are vertically spaced within the conversion compartment to receive electrical plug receptacles affixed to the hot food conversion trays. The conversion trays include a conductive, flat, heating element which is sandwiched between two sheets of thin, insulating material and provides uniform temperature throughout. The warm food is originally placed in the conversion compartment in refrigerated condition. An automatic programmer is provided to terminate the refrigeration action in the conversion compartment and to activate the tray heating plugs in predetermined time to properly heat the warm food immediately prior to serving.
Inventors
- 👤 Joseph R. Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:45
CPC Classifications
A; A47; A47J; A47J39/00; A47J39/006; F; F25; F25D; F25D23/00; F25D23/12; A47B; A47B31/00; A47B31/02; A47B2031/026; Y; Y10; Y10S; Y10S165/00; Y10S165/918; Y10S165/919
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
In a convertible food service cart suitable for storing food in a refrigerated condition in a container placed upon a tray and for heating at least part of the food, the combination of A. a first compartment defining an interior space, 1. said first compartment including first means to refrigerate the food within the first compartment by lowering the temperature within the interior space, 2. said first compartment also including second means to heat the food within the first compartment, a. said second means including a plurality of hot food conversion trays,
Claim 2
Dependent Claim
92 words
In a convertible food service cart suitable for storing food in a refrigerated condition in a container placed upon a tray and for heating at least part of the food, the combination of A. a first compartment defining an interior space, 1. said first compartment including first means to refrigerate the food within the first compartment by lowering the temperature within the interior space, 2. said first compartment also including second means to heat the food within the first compartment, a. said second means including a plurality of hot food conversion trays,
Claim 3
Dependent Claim
192 words
at least some of the conversion trays including a heating element and a connected electrical plug receptacle, 2. said conversion trays receiving a plurality of food containing dishes thereon for heating purposes, b. the second means further including a plurality of electrical plugs communicating with the interior of the first compartment, 1. the receptacle of said conversion trays being electrically interconnected with one said electrical plug to electrically energize the heating element, 2. said heating element heating the food within the container but not heating the interior space; and B. program means to time the cycle of operation of the first means and the second means, 1. said program means including a timer and a time delay relay, the said time delay relay functioning after activation of the second means to prevent function of the first means for a predetermined time delay period, 2. the program means further includes carryover means, the said carryover means functioning the timer during periods when the cart is being moved whereby the timer can continue to program the operation of the first and second means even though the cart is disconnected from a source of power.
Claim 4
Dependent Claim
192 words
at least some of the conversion trays including a heating element and a connected electrical plug receptacle, 2. said conversion trays receiving a plurality of food containing dishes thereon for heating purposes, b. the second means further including a plurality of electrical plugs communicating with the interior of the first compartment, 1. the receptacle of said conversion trays being electrically interconnected with one said electrical plug to electrically energize the heating element, 2. said heating element heating the food within the container but not heating the interior space; and B. program means to time the cycle of operation of the first means and the second means, 1. said program means including a timer and a time delay relay, the said time delay relay functioning after activation of the second means to prevent function of the first means for a predetermined time delay period, 2. the program means further includes carryover means, the said carryover means functioning the timer during periods when the cart is being moved whereby the timer can continue to program the operation of the first and second means even though the cart is disconnected from a source of power.
Claim 5
Dependent Claim
31 words
The convertible food service cart of claim 1 wherein the electrical heating means heat the conversion tray and food contained thereon, but does not heat the atmosphere within the first compartment.
Claim 6
Dependent Claim
89 words
In a convertible food service cart suitable for storing food in a refrigerated condition and for heating part of the food, the combination of A. a first compartment 1. said first compartment including first means to refrigerate the food within the first compartment, 2. said first compartment also including second means to heat the food within the first compartment, a. said second means including a pluarality of hot food conversion trays, 1. at least some of the conversion trays including a heating element and a connected electrical plug receptacle,
Claim 7
Dependent Claim
89 words
In a convertible food service cart suitable for storing food in a refrigerated condition and for heating part of the food, the combination of A. a first compartment 1. said first compartment including first means to refrigerate the food within the first compartment, 2. said first compartment also including second means to heat the food within the first compartment, a. said second means including a pluarality of hot food conversion trays, 1. at least some of the conversion trays including a heating element and a connected electrical plug receptacle,
Claim 8
Dependent Claim
162 words
said conversion trays receiving a plurality of food containing dishes thereon for heating purposes, b. the second means further including a plurality of electrical plugs communicating with the interior of the first compartment, 1. the receptacle of said conversion trays being electrically interconnected with one said electrical plug to electrically energize the heating element; and B. program means to time the cycle of operation of the first means and the second means, 1. said program means including a timer, 2. the program means including a time delay relay, the said time delay relay functioning after activation of the second means to prevent function of the first means for a predetermined time delay period, 3. the program means including a carryover means, the said carryover means functioning the timer during periods when the cart is being moved whereby the timer can continue to program the operation of the first and second means even though the cart is disconnected from a source of power.
Claim 9
Dependent Claim
162 words
said conversion trays receiving a plurality of food containing dishes thereon for heating purposes, b. the second means further including a plurality of electrical plugs communicating with the interior of the first compartment, 1. the receptacle of said conversion trays being electrically interconnected with one said electrical plug to electrically energize the heating element; and B. program means to time the cycle of operation of the first means and the second means, 1. said program means including a timer, 2. the program means including a time delay relay, the said time delay relay functioning after activation of the second means to prevent function of the first means for a predetermined time delay period, 3. the program means including a carryover means, the said carryover means functioning the timer during periods when the cart is being moved whereby the timer can continue to program the operation of the first and second means even though the cart is disconnected from a source of power.
Claim 10
Dependent Claim
31 words
The convertible food service cart of claim 1 wherein the electrical heating means heats the conversion tray and food contained thereon, but does not heat the atmosphere within the first compartment.
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |