US4015068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphitization furnace
Assignee: SIGRI ELEKTROGRAPHIT GmbH
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Filing: 1975-10-20
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Granted: 1977-03-29
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Expires: 1995-10-20
Abstract
Abstract Furnace for the graphitization of carbon bodies in which carbon bodies arranged in continuous row are clamped between two electrodes and heated up to the graphitization temperature by electric resistance heating. The carbon bodies are surrounded by movable shell-shaped walls and the space between the bodies and the walls contains no granular isolation materials. The furnace permits the graphitization of carbon bodies with smaller energy consumption and a shorter time.
Inventors
- 👤 Otto Vohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:29
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/02; F27D11/04; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
Furnace for the graphitization of carbon bodies by direct resistance heating which comprises two current conducting electrodes movable in the longitudinal furnace axis, carbon bodies in an arrangement of at least one row clamped between said electrodes with the end surface of each body in contact with an end surface of an adjacent body in the row, and each end surface of bodies at the end of a row contacting an electrode, carrier members disposed in the furnace floor for receiving the carbon bodies, said furnace gas-tightly enclosing said carbon bodies, said furnace having shell-shaped walls with movable segments and said furnace having layers consisting of isolation materials to protect said carbon bodies from attack by oxygen from the air, and said furnace having a space containing gases between the carbon bodies and the furnace walls.
Claim 2
Dependent Claim
136 words
Furnace for the graphitization of carbon bodies by direct resistance heating which comprises two current conducting electrodes movable in the longitudinal furnace axis, carbon bodies in an arrangement of at least one row clamped between said electrodes with the end surface of each body in contact with an end surface of an adjacent body in the row, and each end surface of bodies at the end of a row contacting an electrode, carrier members disposed in the furnace floor for receiving the carbon bodies, said furnace gas-tightly enclosing said carbon bodies, said furnace having shell-shaped walls with movable segments and said furnace having layers consisting of isolation materials to protect said carbon bodies from attack by oxygen from the air, and said furnace having a space containing gases between the carbon bodies and the furnace walls.
Claim 3
Dependent Claim
31 words
Furnace according to claim 1 wherein the furnace walls are provided on the outside with water cooling and on the inside with an isolation layer of graphite felt and graphite foil.
Claim 4
Dependent Claim
25 words
Furnace according to claim 1 wherein the furnace walls are provided with an inlet for introduction and on outlet for discharge of a protective gas.
References Cited (Backward Citations)
US1029121A
Cited
US1190856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |