US3147331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric shaft furnace
Assignee: Evonik Operations GmbH
•
Filing: 1961-05-01
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Granted: 1964-09-01
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Brugger Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:57
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/02; F27D11/04; B; B01; B01J; B01J3/00; B01J3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
AN ELECTRICALLY HEATED SHAFT FURNACE FOR THE DIRECT HALOGENATION OF BRIQUETTED MATERIAL COMPRISING BRICK MEANS DEFINING A CENTRAL REACTION CHAMBER, A HOLLOW CARBON INSERT IN SAID CHAMBER DEFINING A SPACE AT THE INTERIOR THEREOF FOR SAID BRIQUETTED MATERIAL, A DOME CLOSING SAID REACTION CHAMBER, A CENTRAL HOLLOW ELECTRODE EXTENDING THROUGH SAID DOME AND INTO THE CENTER OF SAID CARBON INSERT, ELECTRICAL MEANS FOR ENERGIZING SAID CARBON INSERT AND SAID CENTRAL CARBON ELECTRODE, MEANS FOR DIRECTING A HALOGEN GAS THROUGH SAID ELECTRODE AND INTO SAID REACTION CHAMBER, AND MEANS FOR OSCILLATING SAID CENTRAL CARBON ELETRODE THROUGH A VERTICAL UP AND DOWN MOVEMENT DURING THE REACTION IN THE REACTION CHAMBER
Claim 2
Dependent Claim
108 words
AN ELECTRICALLY HEATED SHAFT FURNACE FOR THE DIRECT HALOGENATION OF BRIQUETTED MATERIAL COMPRISING BRICK MEANS DEFINING A CENTRAL REACTION CHAMBER, A HOLLOW CARBON INSERT IN SAID CHAMBER DEFINING A SPACE AT THE INTERIOR THEREOF FOR SAID BRIQUETTED MATERIAL, A DOME CLOSING SAID REACTION CHAMBER, A CENTRAL HOLLOW ELECTRODE EXTENDING THROUGH SAID DOME AND INTO THE CENTER OF SAID CARBON INSERT, ELECTRICAL MEANS FOR ENERGIZING SAID CARBON INSERT AND SAID CENTRAL CARBON ELECTRODE, MEANS FOR DIRECTING A HALOGEN GAS THROUGH SAID ELECTRODE AND INTO SAID REACTION CHAMBER, AND MEANS FOR OSCILLATING SAID CENTRAL CARBON ELETRODE THROUGH A VERTICAL UP AND DOWN MOVEMENT DURING THE REACTION IN THE REACTION CHAMBER
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |