Patent US3710775A successfully refreshed from Google Patents.
US3710775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot air cooking oven
Assignee: Rinnai Corp
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Filing: 1971-12-13
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Granted: 1973-01-16
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Expires: 1991-12-13
Abstract
Abstract A hot air oven comprises a heating chamber with a partition plate at the rear thereof defining a blower chamber therebehind in which is mounted a blower, the partition plate having an opening facing the blower. A combustion chamber is below the heating chamber and mounts a burner which produces heated air which flows through a hot air duct to the heating chamber at a location proximate the opening in the partition plate so that the hot air is drawn into the blower chamber. The hot air is then forced by the blower through side openings in the blower chamber into the heating chamber. The blower chamber also has an exhaust opening for discharge of exhaust gas to the outside.
Inventors
- 👤 K Tamada
- 👤 T Takase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:14
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/32; F24C15/322; F24C15/16; F24C3/00; F24C3/02; F24C3/027
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A hot air oven comprising a heating chamber, a partition plate at the rear of the heating chamber defining a blower chamber therebehind, said partition plate having a suction opening therein, a blower mounted in the blower chamber adjacent said suction opening, a combustion chamber below the heating chamber, a burner in said combustion chamber having flame openings, said combustion chamber being provided with an air supply opening, a hot air duct connecting the combustion chamber and the heating chamber and enabling the air heated by the burner to be drawn through the hot air duct to the blower, said blower chamber being provided with left and right air conducting openings for conducting hot air expelled by the blower into the heating chamber, said blower chamber also having an exhaust opening for discharging exhaust gas to the exterior.
Claim 2
Dependent Claim
138 words
A hot air oven comprising a heating chamber, a partition plate at the rear of the heating chamber defining a blower chamber therebehind, said partition plate having a suction opening therein, a blower mounted in the blower chamber adjacent said suction opening, a combustion chamber below the heating chamber, a burner in said combustion chamber having flame openings, said combustion chamber being provided with an air supply opening, a hot air duct connecting the combustion chamber and the heating chamber and enabling the air heated by the burner to be drawn through the hot air duct to the blower, said blower chamber being provided with left and right air conducting openings for conducting hot air expelled by the blower into the heating chamber, said blower chamber also having an exhaust opening for discharging exhaust gas to the exterior.
Claim 3
Dependent Claim
21 words
An oven as claimed in claim 1 wherein said air supply opening in the combustion chamber is directly below the burner.
Claim 4
Dependent Claim
20 words
An oven as claimed in claim 1 wherein said flame openings of the burner face towards the hot air duct.
Claim 5
Dependent Claim
35 words
An oven as claimed in claim 1 wherein said suction opening is circular and said hot air duct has an upper curved opening which is in correspondence with the lower portion of the suction opening.
Claim 6
Dependent Claim
41 words
An oven as claimed in claim 1 comprising a curved guide plate in said combustion chamber extending upwardly and over the burner in the direction of the flame openings to guide the flow of hot air to said hot air duct.
Claim 7
Dependent Claim
30 words
An oven as claimed in claim 5 wherein said guide plate is mounted in said combustion chamber at the side of the air supply opening remote from the flame openings.
Claim 8
Dependent Claim
48 words
An oven as claimed in claim 1 wherein said exhaust opening in the blower chamber is at the top of said blower chamber and constitutes a main exhaust opening, said blower chamber having at least one subsidiary exhaust opening located radially outwards of the periphery of the blower.
Claim 9
Dependent Claim
39 words
An oven as claimed in claim 1 wherein said heating chamber has side walls and inner plates disposed parallel to said side walls defining passages for the flow of hot air from the blower chamber to the heating chamber.
Claim 10
Dependent Claim
31 words
An oven as claimed in claim 8 wherein each of said inner plaTes has at least one vertical row of tabs for support of a cooking pan in the heating chamber.
Claim 11
Dependent Claim
30 words
An oven as claimed in claim 9 wherein said tabs are bent inwardly from said inner plates to provide apertures for branched flow of hot air into the heating chamber.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |