Aluminum production apparatus
Abstract
Abstract APPARATUS HAVING A POT IN WHICH ALUMINA AND CRYOLITE ARE ELECTRICALLY HEATED, COMPRISING: TWIN CARBONACEOUS ANODE BLOCKS, HAVING ALIGNED HORIZONTAL BORES; STEEL CARBON-BLOCK HOLDING, VERTICAL STEMS; AND A JOINED HORIZONTAL STEEL PIN THAT FITS IN THE ALIGNED BORES, WITH A SLIP-FIT CLEARANCE IN ASSEMBLY AT ROOM TEMPERATURE, AND TIGHT, CURRENT-CONDUCTING CONTACT WHEN IN THE HEATED MATERIALS. THE INVENTION COMPRISES: MEANS FOR MANUALLY OR AUTOMATICALLY JACKING ANODES UP OR DOWN SEPARATELY OR TOGETHER; MEANS FOR MAINTAINING A PREDETERMINED VOLTAGE ACROSS EACH POT OF A POT LINE, EACH OF THESE VOLTAGES BEING SET FOR EFFICIENCY OF A PARTICULAR POT; A CARBON-BLOCK ANODE HAVING A VERTICAL FACE FOR FITTING AGAINST THE SIMILAR FACE OF A TWIN BLOCK, AND A PIN-FITTING, HORIZONTAL BORE TERMINATING AT THE VERTICAL FACE; AND A METHOD OF REPLACEMENT OF A HEAT-WORN CARBON-BLOCK BUTT BY JACKING IT UP, COOLING THE PIN UTIL IT HAS CLEARANCE IN THE BORE, REMOVING THE BUTT, AND REPLACING A BLOCK ON THE PIN.
Inventors
- 👤 C Elliott
Bibliographic Details
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |