US4038968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air screen for food warming table
Assignee: Individual
•
Filing: 1975-06-03
•
Granted: 1977-08-02
•
Expires: 1995-06-03
Abstract
Abstract An air curtain is provided across the top of a food warming table, such as is employed in cafeterias for keeping food hot for serving. An air stream flows across the top of the pans holding the cooked food, where it picks up heat, moisture and flavor components, and is continuously recirculated to form an air curtain. Which retards the outflow of moisture and heat from the surface of the food. Keeping a cushion of hot moist air on the food maintains it in a hot and moist condition. Additionally, the air curtain acts to keep dust and insects away from the food surface.
Inventors
- 👤 Alfred Rovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:01
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/24; A47J36/2483; A47J36/26; F; F24; F24C; F24C15/00; F24C15/20; F24C15/2042; A47B; A47B2200/00; A47B2200/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A food warming table for maintaining food at a hot serving temperature and to prevent loss of moisture which comprises: at least one trough-like receptacle having heating means located at its lower portion; at least one stationary food receiving pan location within the said receptacle having hot food therein and spaced above said heating means, whereby said pan is heated by the heating means; the trough-like receptacle and the pan having upper perimeters that are substantially flush and horizontal; a moving air current confined essentially to the lateral boundaries of the pan, and moving in a direction parallel to the plans of the upper perimeter whereby an air curtain over the food in the pan is maintained; said air current being adapted to absorb moisture, heat and flavor components from the food in its passage over the said food, so that said air current is heated, moist and contains flavor components; means for accepting the air current at a location adjacent one end of the pan and redirecting it to an opposite end of said pan; and means for imparting motion to said air current.
Claim 2
Dependent Claim
185 words
A food warming table for maintaining food at a hot serving temperature and to prevent loss of moisture which comprises: at least one trough-like receptacle having heating means located at its lower portion; at least one stationary food receiving pan location within the said receptacle having hot food therein and spaced above said heating means, whereby said pan is heated by the heating means; the trough-like receptacle and the pan having upper perimeters that are substantially flush and horizontal; a moving air current confined essentially to the lateral boundaries of the pan, and moving in a direction parallel to the plans of the upper perimeter whereby an air curtain over the food in the pan is maintained; said air current being adapted to absorb moisture, heat and flavor components from the food in its passage over the said food, so that said air current is heated, moist and contains flavor components; means for accepting the air current at a location adjacent one end of the pan and redirecting it to an opposite end of said pan; and means for imparting motion to said air current.
Claim 3
Dependent Claim
40 words
The apparatus of claim 1 wherein the air current is conveyed from a location adjacent one end of the pan to a location adjacent another end of the pan via duct means, said duct means passing beneath the trough-like receptacle.
Claim 4
Dependent Claim
56 words
The apparatus of claim 2 wherein the ducts have upper ends adjacent the said ends of the pan, the upper duct ends extending transversely across the pan ends, and the said duct ends being open, whereby the air current can leave one duct end, blanket the pan and its contents and enter the other duct end.
Claim 5
Dependent Claim
16 words
The apparatus of claim 3 having a blower or fan means for impelling the air stream.
Claim 6
Dependent Claim
19 words
The apparatus of claim 4 wherein the duct has a drain at a low point for removing any condensate.
Claim 7
Dependent Claim
23 words
The apparatus of claim 5 having additionally a filter located in the duct means for screening out particulate matter from the air current.
References Cited (Backward Citations)
US2833906A
Cited
US2967404A
Cited
US3163024A
Cited
US3502020A
Cited
US3474724A
Cited
US3561230A
Cited
US3713401A
Cited
US3780794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |