Patent US5431682A successfully refreshed from Google Patents.
US3554505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walking beam furnaces
Assignee: Heurtey SA
•
Filing: 1968-12-12
•
Granted: 1971-01-12
•
Expires: 1988-12-12
Abstract
Abstract A beam furnace comprises at least two main zones, one of which is for heating and the other for equalizing the temperatures of the charge elements. The beams of the first zone include charge supports which maintain the charge spaced from the furnace bottom and the beams of the second zone a bottom coating on which the charge rests directly.
Inventors
- 👤 Pierre Dessarts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:56
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/201; F27B9/202; F27B9/207; C; C21; C21D; C21D9/00; C21D9/0081
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A walking beam furnace comprising at least a first main heating zone for heating individual charge elements, a second main equalizing zone for equalizing the temperatures thereof, beams in said first zone including charge supports for keeping said charge elements spaced from a corresponding furnace bottom so that said elements are heated on the upper and lower surfaces thereof, and beams in said second zone including a lining at the same level as the beams in the first zone for supporting said elements such that they rest directly on said lining so that the elements are directly heated on the upper surfaces thereof and temperature equalized on said lower surfaces by contact with said lining, said charge elements being individually transferred through the furnace by direct and successive travel on said beams.
Claim 2
Dependent Claim
132 words
A walking beam furnace comprising at least a first main heating zone for heating individual charge elements, a second main equalizing zone for equalizing the temperatures thereof, beams in said first zone including charge supports for keeping said charge elements spaced from a corresponding furnace bottom so that said elements are heated on the upper and lower surfaces thereof, and beams in said second zone including a lining at the same level as the beams in the first zone for supporting said elements such that they rest directly on said lining so that the elements are directly heated on the upper surfaces thereof and temperature equalized on said lower surfaces by contact with said lining, said charge elements being individually transferred through the furnace by direct and successive travel on said beams.
Claim 3
Dependent Claim
17 words
A furnace according to claim 1, in which said beams of said two zones are rigidly interconnected.
Claim 4
Dependent Claim
19 words
A furnace according to claim 1, in which said beams of said two zones are independent of each other.
Claim 5
Dependent Claim
42 words
A furnace according to claim 1, in which said supports for maintaining said charge elements spaced from said furnace bottom comprise columns, and stringers supported on the columns, said columns and stringers including cooling means in which is circulated a cooling fluid.
Claim 6
Dependent Claim
61 words
A furnace according to claim 4 comprising a lining in said first zone on which said columns are fitted, means for moving said linings in said first and second zones in grooves provided in stationary portions of the furnace bottom, and sealing means between the linings and stationary portions including skirts dipping into a continuous hydraulic seal associated with said portions.
Claim 7
Dependent Claim
60 words
A furnace according to claim 1 comprising a lining in said first zone supporting said beams, said lining in said second zone being raised above the lining in said first zone, said charge supports comprising conveyor stringers in said first zone mounted on the lining therein and disposed substantially in the same plane as said lining in said second zone.
Claim 8
Dependent Claim
13 words
A furnace according to claim 6 wherein said linings are of refractory material.
Claim 9
Dependent Claim
18 words
A furnace according to claim 7 comprising a refractory wall connecting said linings to form a step therebetween.
Claim 10
Dependent Claim
21 words
A furnace according to claim 7 wherein the furnace bottom in each zone is substantially coplanar with the associated lining therein.
Claim 11
Dependent Claim
17 words
A furnace according to claim 1 wherein said lining in said second zone is of refractory material.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |