Patent US3978843A successfully refreshed from Google Patents.
US3978843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Food cooking oven with controlled air circulation
Assignee: Buderus AG
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Filing: 1975-01-06
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Granted: 1976-09-07
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Expires: 1995-01-06
Abstract
Abstract A food cooking oven has a closed muffle in which there is provided an axial-input radial-output blower that is rotated by a drive motor outside the housing so as to circulate gases in the housng in a closed path passing through the blower. At least one vane is provided in the housng at one of the sides of the blower so as to limit air circulation therein and prevent excessively strong currents of air in the housing from damaging delicate foodstuffs. This may be a disc vane in front of the axial input of the blower or a pair of elongaged vanes flanking the blower at the output sides thereof.
Inventors
- 👤 Wilfried Durth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:47
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/32; F24C15/322
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
An apparatus for treating a foodstuff, said apparatus comprising: a generally closed housing; means in said housing for supporting said foodstuff therein; a fan in said housing having an input side and an output side; drive means for rotating said fan and circulating air in said housing in a closed path over said foodstuff and through said fan from the input side to the output side thereof; means in said path in said housing for heating said air; at least one swingably displaceable vane in said housing adjacent one of said sides; and control means operable externally of said housing and a transmission operatively connecting said control means with said vane varying the orientation of said vane in said path for controlledly limiting air ciculation along said path.
Claim 2
Independent Claim
128 words
An apparatus for treating a foodstuff, said apparatus comprising: a generally closed housing; means in said housing for supporting said foodstuff therein; a fan in said housing having an input side and an output side; drive means for rotating said fan and circulating air in said housing in a closed path over said foodstuff and through said fan from the input side to the output side thereof; means in said path in said housing for heating said air; at least one swingably displaceable vane in said housing adjacent one of said sides; and control means operable externally of said housing and a transmission operatively connecting said control means with said vane varying the orientation of said vane in said path for controlledly limiting air ciculation along said path.
Claim 3
Dependent Claim
14 words
The apparatus defined in claim 1 wherein said fan is an axial-input radial-output fan.
Claim 4
Dependent Claim
16 words
The apparatus defined in claim 2 wherein said vane is arranged upstream of said input side.
Claim 5
Dependent Claim
16 words
The apparatus defined in claim 2 wherein said vane is provided downstream of said output side.
Claim 6
Dependent Claim
21 words
The apparatus defined in claim 4 wherein a pair of said vanes are provided flanking said fan at said output side.
Claim 7
Dependent Claim
31 words
The apparatus defined in claim 2 wherein said means for supporting includes a rack having perforated side walls and a back wall formed with a hole turned toward said input side.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |