US3669090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning an oven with internal air circulation
Assignee: Individual
•
Filing: 1970-05-25
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Granted: 1972-06-13
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Expires: 1990-05-25
Abstract
Abstract A self-cleaning oven is provided with a rack which is substantially closed at its sides, fully open at one end, and formed as a hood at the other end. A centrifugal fan is provided in the oven at the hood used to circulate air around and through the rack. An air inlet is provided in the oven wall that opens adjacent the fan intake. The oven is further provided with an outlet fitted with a catalytic afterburner. During heating of the oven to 400*-500* C. for cleaning, fresh air is drawn in through the inlet, circulated throughout the oven interior, and exhaust gases pass out through the afterburner.
Inventors
- 👤 Anton Ladislaus Jung
- 👤 Erhard Ledwon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:58
CPC Classifications
F; F24; F24C; F24C14/00; F24C14/02; F24C14/025; F04; F04D; F04D25/00; F04D25/02; F04D25/08; F04D25/082; F04D29/00; F04D29/58; F04D29/5806; F04D29/582; F04D29/5853
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
A method of cleaning an elongated cooking chamber having a longitudinal horizontal axis and a rear wall, said method comprising the steps of: drawing gases along the horizontal axis of said chamber toward the rear wall thereof and expelling said gases uniformly radially outwardly in said chamber from said axis adjacent said wall to circulate said gases in said chamber in contact with all internal surfaces thereof; introducing into said chamber an oxygen-containing gas at a location adjacent said rear wall and offset from said axis; removing an exhaust gas from said chamber through an outlet remote from said rear wall; catalytically afterburning said exhaust gas at said outlet; and heating said gas adjacent said rear wall in a ring all around said axis to a temperature sufficiently elevated to pyrolitically decompose food residue on said surfaces of said chamber.
Claim 2
Independent Claim
140 words
A method of cleaning an elongated cooking chamber having a longitudinal horizontal axis and a rear wall, said method comprising the steps of: drawing gases along the horizontal axis of said chamber toward the rear wall thereof and expelling said gases uniformly radially outwardly in said chamber from said axis adjacent said wall to circulate said gases in said chamber in contact with all internal surfaces thereof; introducing into said chamber an oxygen-containing gas at a location adjacent said rear wall and offset from said axis; removing an exhaust gas from said chamber through an outlet remote from said rear wall; catalytically afterburning said exhaust gas at said outlet; and heating said gas adjacent said rear wall in a ring all around said axis to a temperature sufficiently elevated to pyrolitically decompose food residue on said surfaces of said chamber.
Claim 3
Dependent Claim
21 words
The method defined in claim 1 wherein said chamber is provided with a rack, said gases being blown around said rack.
Claim 4
Dependent Claim
19 words
The method defined in claim 1 wherein said oxygen-containing gas is introduced into said chamber by being drawn in.
Claim 5
Dependent Claim
31 words
The method defined in claim 1 wherein said oven is heated adjacent said rear wall by passing it in contact with heating elements at a temperature of 400* to 500* C.
Claim 6
Dependent Claim
25 words
The method defined in claim 4 wherein the gas in said chamber is circulated at a rate exceeding the volume of said oven per minute.
Claim 7
Dependent Claim
42 words
The method defined in claim 5, further comprising the step of admitting air to said oven substantially at the rate at which exhaust gas is removed therefrom and less than the volume of said oven per minute to constitute said oxygen-containing gas.
Claim 8
Dependent Claim
24 words
The method defiNed in claim 6 wherein said air is aspirated into said oven by the circulation of the gases at said rear wall.
Claim 9
Dependent Claim
23 words
The method defined in claim 7 wherein said outlet is formed along a wall of said chamber other other than said rear wall.
Claim 10
Dependent Claim
27 words
The method defined in claim 8 wherein the oven is provided with a rack and the gases pass around said rack upon movement toward said rear wall.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |