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US4040778A Expired / Lapsed US ⏱️ 0.0 years remaining

Baking pit furnaces

Assignee: REFRACTORY SERVICES INTERNATIONAL Ltd
•
Filing: 1975-12-12
•
Granted: 1977-08-09
•
Expires: 1995-12-12
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Abstract

Abstract Baking pit furnaces have flues cast in several inter-related parts in refractory concrete and which are assembled from the cast parts which are compacted during casting in mould means by inducing small vibrations at high frequency to the moulds in which they are cast; flues assembled from the cast parts preferably include baffles extending between side walls thereof midway of their lengths and means tying the side walls together over each length thereof defined between a control baffle and each of the two end walls of the flue. Central baffles may be rooted in the bottom walls of the flues, and all corners and free baggle edges are preferably rounded. Directional vanes are disclosed with the free baffle edges, each of said vanes being of arcuate cross-sectional shape and extending between the side walls of the flue spaced from the associated free baffle edge.

Inventors

  • 👤 William Brown Black

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 09:38
CPC Classifications
F; F27; F27B; F27B13/00; F27B13/06; Y; Y02; Y02P; Y02P10/00; Y02P10/25

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 69 words
A baking pit furnace flue formed of interconnected precast refractory concrete parts including two side walls, two end walls, a bottom wall, a cap, a central baffle extending between said side walls substantially midway between said end walls of said flue, and tying means for said side walls together over each length thereof positioned between said central baffle and each one of said two end walls of said flue.
Claim 2
Dependent Claim 69 words
A baking pit furnace flue formed of interconnected precast refractory concrete parts including two side walls, two end walls, a bottom wall, a cap, a central baffle extending between said side walls substantially midway between said end walls of said flue, and tying means for said side walls together over each length thereof positioned between said central baffle and each one of said two end walls of said flue.
Claim 3
Dependent Claim 17 words
A flue as claimed in claim 1, in which said tying means comprises ties of circular section.
Claim 4
Dependent Claim 15 words
A flue as claimed in claim 1, in which said tying means comprises further baffles.
Claim 5
Dependent Claim 18 words
A flue as claimed in claim 1, in which said central baffle is rooted in said bottom wall.
Claim 6
Dependent Claim 18 words
A flue as claimed in claim 2, in which said central baffle is rooted in said bottom wall.
Claim 7
Dependent Claim 18 words
A flue as claimed in claim 3, in which said central baffle is rooted in said bottom wall.
Claim 8
Dependent Claim 17 words
A flue as claimed in claim 6, in which all corners and free baffle edges are rounded.
Claim 9
Dependent Claim 48 words
A flue as claimed in claim 7, additionally including a directional vane associated with and adjacent each free baffle edge, each said directional vane being of arcuate cross-sectional shape and extending between said side walls of said flue at the same spacing from their associated free baffle edge.

References Cited (Backward Citations)

US1383378A Cited
US2813708A Cited
US3048382A Cited
US3448971A Cited
US3656721A Cited
US3672649A Cited
US3848034A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-08-08 1981-02-07 1981-08-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-08-08 1985-02-07 1985-08-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-08-08 1989-02-07 1989-08-09 $7700.00 Window Closed / Lapsed

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