Patent US3578069A successfully refreshed from Google Patents.
US3578069A
Expired / Lapsed
US
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Apparatus for firing carbon-containing products
Assignee: Pechiney SA
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Filing: 1969-02-10
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Granted: 1971-05-11
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Expires: 1989-02-10
Abstract
Abstract Method and apparatus for firing carbon-containing products which involve processing the products through four zones, including a heating zone, a zone for release and combustion of volatile materials, a final heating zone, and a cooling zone, and in which the final heating zone provides for the heating of the products from the inside out thereby to achieve uniform temperature distribution in this stage of the operation to provide a more efficient process and a more desirable product.
Inventors
- 👤 Paul Morel
- 👤 Jean-Pierre Givry
- 👤 Philippe Voisin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:02
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08; H05B7/085; C; C01; C01B; C01B32/00; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
55 words
An installation as claimed in claim 1 which includes means for introducing air into the tunnel furnace through the outlet end and exhausting the combustion gases from the furnace at the inlet end and means for introducing products to be fired into the furnace at the inlet end and for removal from the outlet end.
Claim 2
Dependent Claim
55 words
An installation as claimed in claim 2 which includes inlet means adjacent the pump between the zones of the tunnel furnace, and means for recirculating a part of the gas exhausted from the inlet end of the furnace to said inlet means for the recirculation of combustion gases through a portion of the tunnel furnace.
Claim 3
Dependent Claim
29 words
An installation as claimed in claim 3 which includes means for diverting a part of the gas exhausted from the inlet end of the tunnel furnace to a chimney.
Claim 4
Dependent Claim
36 words
An installation as claimed in claim 1 which includes burners in the tunnel furnace adjacent the outlet end portion for combustion of air introduced into the furnace to heat the products and tO inert the gas.
Claim 5
Dependent Claim
26 words
An installation as claimed in claim 1 in which the electrical heating means for heating the products in the fluidtight chamber comprises an induction heating means.
Claim 6
Dependent Claim
27 words
An installation as claimed in claim 1 which is characterized in that the tunnel furnace includes a homogenization zone at constant temperature in its outlet end portion.
References Cited (Backward Citations)
US2621218A
Cited
US3474544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |