US2731407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of collecting gases from aluminum furnaces
Assignee: Elektrokemisk AS
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Filing: 1952-02-12
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Granted: 1956-01-17
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Expires: 1972-02-12
Abstract
No abstract record available.
Inventors
- 👤 Mathias O Sem
- 👤 Sejersted Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:52
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
A METHOD OF COLLECTING GASES FROM AN ALUMINUM FURNACE OF THE TYPE COMPRISING A POT FOR THE FURNACE CHARGE, A RECTANGULAR CASING FOR GUIDING THE ELECTRODE DOWN TOWARD THE POT AND A RECTANGULAR CARBONACEOUS ELECTRODE IN SAID CASING OF GREATER LENGTH THAN WIDTH WHICH COMPRISES THE STEPS OF MAINTAINING WITHIN THE POT A CHARGE OF ALUMINA DISSOLVED N MOLTEN CRYOLITE UNDER CONDITIONS WHICH RESULT IN A CRUST FORMING ON SUCH CHARGE, MAINTAINING A LAYER OF ALUMINA DIRECTLY ON SUCH CRUST EXPOSED AT ITS UPPER SUFACE TO THE OUTER AIR WHICH LAYER CONTACTS THE CASING ALONG ITS LONGER SIDES TO FORM A SEAL BETWEEN THE CRUST AND THE CASING, MAINTAINING CONDITIONS SO THAT A GAS CHANNEL OF EXTENDED LENGTH FORMS ALONG THE SIDE OF THE ELECTRODE BENEATH SAID CRUST, WITHDRAWING GASES FROM WITHIN SAID CHANNEL AT THE ENDS THEREOF WHILE THE CHANNEL IS SO MAINTAINED SO THAT GAS PRESSURE UNDER SAID LAYER IS PREVENTED FROM BUILDING UP SUFFICIENTLY TO CAUSE THE GASES TO BREAK THROUGH SUCH LAYER, CONDUCTING SAID GASES SUBSTANTIALLY OUT OF CONTACT WITH AIR TO A POINT REMOVED FROM THE CRUST AND BURNING THEM AT SUCH POINT.
Claim 2
Independent Claim
188 words
A METHOD OF COLLECTING GASES FROM AN ALUMINUM FURNACE OF THE TYPE COMPRISING A POT FOR THE FURNACE CHARGE, A RECTANGULAR CASING FOR GUIDING THE ELECTRODE DOWN TOWARD THE POT AND A RECTANGULAR CARBONACEOUS ELECTRODE IN SAID CASING OF GREATER LENGTH THAN WIDTH WHICH COMPRISES THE STEPS OF MAINTAINING WITHIN THE POT A CHARGE OF ALUMINA DISSOLVED N MOLTEN CRYOLITE UNDER CONDITIONS WHICH RESULT IN A CRUST FORMING ON SUCH CHARGE, MAINTAINING A LAYER OF ALUMINA DIRECTLY ON SUCH CRUST EXPOSED AT ITS UPPER SUFACE TO THE OUTER AIR WHICH LAYER CONTACTS THE CASING ALONG ITS LONGER SIDES TO FORM A SEAL BETWEEN THE CRUST AND THE CASING, MAINTAINING CONDITIONS SO THAT A GAS CHANNEL OF EXTENDED LENGTH FORMS ALONG THE SIDE OF THE ELECTRODE BENEATH SAID CRUST, WITHDRAWING GASES FROM WITHIN SAID CHANNEL AT THE ENDS THEREOF WHILE THE CHANNEL IS SO MAINTAINED SO THAT GAS PRESSURE UNDER SAID LAYER IS PREVENTED FROM BUILDING UP SUFFICIENTLY TO CAUSE THE GASES TO BREAK THROUGH SUCH LAYER, CONDUCTING SAID GASES SUBSTANTIALLY OUT OF CONTACT WITH AIR TO A POINT REMOVED FROM THE CRUST AND BURNING THEM AT SUCH POINT.
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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |