US4062983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for maintaining heat and moisture in food
Assignee: Hatco Corp
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Filing: 1976-08-11
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Granted: 1977-12-13
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Expires: 1996-08-11
Abstract
Abstract A method for holding food and the like at desired temperature and moisture levels for an extended period of time wherein a holding chamber confines a volume of air about a food disposed therein, an air flow supply produces a stream of heated humidified air that is directed in a curtain-like vortex pattern around the outer perimeter of the inside of the holding chamber to form a core of relatively still, heated moisturized air about the food to transmit heat and moisture thereto without a significant amount of air flow in direct contact with the food. A power control circuit is used to selectively operate a blower motor that circulates the air in a closed air flow system, a heating element that heats the air, a removable food rack motor that rotates the food in the holding chamber and lights that illuminate the food in the holding chamber.
Inventors
- 👤 Ronald R. Roderick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:36
CPC Classifications
A; A47; A47J; A47J37/00; A47J37/04; A47J37/043; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A47J39/00; A47J39/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
In a method of holding heat and moisture in a food comprising the steps of: confining a food in a volume of substantially still air; and directing a stream of heated, humidified air in a vortex pattern around the food substantially out of direct contact with the food so that there is no significant amount of airflow impinging on the food and so that there remains a core of said substantially still air about the food which is heated and moisturized by said stream to hold the food at a selected temperature and at a selected moisture content level.
Claim 2
Dependent Claim
99 words
In a method of holding heat and moisture in a food comprising the steps of: confining a food in a volume of substantially still air; and directing a stream of heated, humidified air in a vortex pattern around the food substantially out of direct contact with the food so that there is no significant amount of airflow impinging on the food and so that there remains a core of said substantially still air about the food which is heated and moisturized by said stream to hold the food at a selected temperature and at a selected moisture content level.
Claim 3
Dependent Claim
29 words
In a method as set forth in claim 1 wherein said stream of heated, humidified air is recycled in a closed circulating system back to be reheated and rehumidified.
Claim 4
Dependent Claim
106 words
In a method of holding heat and moisture in a food comprising the steps of: confining a food in a volume of relatively still air; and simultaneously applying heat and moisture about the food by passing a stream of heated, humidified air in a curtain-like vortex pattern around the food substantially out of direct airflow contact with the food so that there is no significant amount of airflow impinging on the food and so that there remains a core of said substantially still air about the food which is heated and moisturized by said stream to maintain the food at a selected heat and moisture level.
Claim 5
Dependent Claim
106 words
In a method of holding heat and moisture in a food comprising the steps of: confining a food in a volume of relatively still air; and simultaneously applying heat and moisture about the food by passing a stream of heated, humidified air in a curtain-like vortex pattern around the food substantially out of direct airflow contact with the food so that there is no significant amount of airflow impinging on the food and so that there remains a core of said substantially still air about the food which is heated and moisturized by said stream to maintain the food at a selected heat and moisture level.
Claim 6
Dependent Claim
30 words
In a method as set forth in claim 3 wherein said humidified air is produced by passing a stream of heated air over the surface of a body of water.
Claim 7
Dependent Claim
43 words
In a method as set forth in claim 3 wherein the velocity of the air about the food is less that 3 feet per second and the temperature range of the air in the holding chamber is from 70° F to 220° F.
Claim 8
Dependent Claim
128 words
In a method of holding heat and moisture in a food the steps of: confining a food in a volume of substantially still air in a chamber; directing a stream of heated air in a prescribed pattern in relation to said volume of substantially still air in a direction away from and yet in heat exchange relation to the food, said pattern being primarily along the outer periphery of the inside of said chamber and retaining a core of said substantially still air about the food so that there is no significant amount of airflow impinging on the food; and humidifying said stream of heated air said stream heating and moistening said core of substantially still air to maintain the food at a selected heat and moisture level.
Claim 9
Dependent Claim
128 words
In a method of holding heat and moisture in a food the steps of: confining a food in a volume of substantially still air in a chamber; directing a stream of heated air in a prescribed pattern in relation to said volume of substantially still air in a direction away from and yet in heat exchange relation to the food, said pattern being primarily along the outer periphery of the inside of said chamber and retaining a core of said substantially still air about the food so that there is no significant amount of airflow impinging on the food; and humidifying said stream of heated air said stream heating and moistening said core of substantially still air to maintain the food at a selected heat and moisture level.
Claim 10
Dependent Claim
38 words
In a method as set forth in claim 6 wherein said prescribed pattern for said stream of heated air is at least a part of a vortex forming a core of substantially still, heated air about the food.
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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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |