US3687431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheating of dry aggregate for carbon electrodes
Assignee: Alcoa Corp
•
Filing: 1970-12-18
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Granted: 1972-08-29
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Expires: 1990-12-18
Abstract
Abstract A process for heating aggregate particles of calcined coke for mixing with a carbonaceous binder such as pitch. The process comprises the steps of directing the particles to a bed thereof fluidized by a gaseous stream, heating the particles with a source of radiant heat disposed directly in the path of the fluidizing stream, preferably directly in the bed itself, and removing the heated particles from the bed for immediate mixing with the carbonaceous binder.
Inventors
- 👤 Keith W Parks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:42
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/36; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
The process of claim 1 including the step of supplying heat to the heated surface from a source of heat energy located separately from the heating vessel and closed-loop arrangement.
Claim 2
Dependent Claim
117 words
A process for preheating particles of calcined coke to be used in the manufacture of carbon electrodes, said process comprising the steps of directing said particles to a fluidized bed thereof within a housing structure, said bed being fluidized by a gaseous medium directed upwardly through said bed and housing structure, and recirculated thereto through a closed-loop arrangement connecting the housing structure on opposed sides of said fluidized bed in fluid communication, the components of said bed comprising said particles and said fluidizing medium, heating said particles by contacting at least one of the components of said bed with a heated surface, and removing the heated particles from said bed for mixing with a carbonaceous binder material.
Claim 3
Dependent Claim
30 words
The process of claim 3 including the step of supplying heat to the heated surface from a source of heat energy located separately from the housing structure and closed-loop arrangement.
References Cited (Backward Citations)
US2582710A
Cited
US2525790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |