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Patent US3658047A successfully refreshed from Google Patents.
US3658047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Food warming oven with removable tray racks
Assignee: Norris Food Service Inc
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Filing: 1970-11-05
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Granted: 1972-04-25
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Expires: 1990-11-05
Abstract
Abstract A food warming oven having removable tray racks for receiving different sized and configured trays. A gas-fired, forced-air oven has a pair of inner parallel walls spaced apart from the outer oven walls thereby forming vertical air passages. The inner walls are louvered to allow the air flowing through the passages to pass through the inner walls and across trays positioned atop the tray racks removably mounted to the mutually facing sides of the inner walls. Each tray rack has a pair of flanges with ends inserted through slots in the inner wall. Three parallel rods are fixedly secured to the flanges and are arranged in stepped configuration. A vent is provided with a controllable butterfly valve to allow a portion of the warm air to escape from the oven.
Inventors
- 👤 Hermann E Happel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:17
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/32; F24C15/322; F24C15/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A food warming oven comprising: an outer oven housing having a door; a first wall and a second wall being louvered, parallel and spaced apart, said first and second wall positioned within said housing forming a vertical air passage between said housing and said first wall and another vertical air passage between said housing and said second wall; tray mounting racks removably mounted to said first wall and said second wall, said racks mounted to said first wall being aligned in elevation with said racks mounted to said second wall, each of said racks having outer tray receivers and inner tray receivers; and, removable trays positioned between said first wall and said second wall, said trays being restable atop said outer tray receivers and said inner tray receivers.
Claim 2
Dependent Claim
128 words
A food warming oven comprising: an outer oven housing having a door; a first wall and a second wall being louvered, parallel and spaced apart, said first and second wall positioned within said housing forming a vertical air passage between said housing and said first wall and another vertical air passage between said housing and said second wall; tray mounting racks removably mounted to said first wall and said second wall, said racks mounted to said first wall being aligned in elevation with said racks mounted to said second wall, each of said racks having outer tray receivers and inner tray receivers; and, removable trays positioned between said first wall and said second wall, said trays being restable atop said outer tray receivers and said inner tray receivers.
Claim 3
Dependent Claim
55 words
The oven of claim 1 wherein: all of said receivers are rods, each of said racks have an outer receiver positioned above an inner receiver, said racks have a pair of flanges secured to said outer receiver and said inner receiver with ends insertable through and mountable to said first wall and said second wall.
Claim 4
Dependent Claim
38 words
The oven of claim 2 additionally comprising: intermediate rods mounted atop said flanges being parallel with and positioned between said inner tray receivers and said outer tray receivers; and wherein, said trays are restable atop said intermediate rods.
Claim 5
Dependent Claim
27 words
The oven of claim 3 wherein: said first wall and said second wall have slots receiving said flanges; and, said trays are of different sizes and configurations.
Claim 6
Dependent Claim
72 words
The oven of claim 4 wherein: said oven has an air heater and a fan operable to circulate warm air up one of said passages, through said first wall, across said trays, through said second wall and down through the other of said passages; and, said oven has an air vent communicating with one of said passages and is operable to allow a portion of said warm air to exit said oven.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |